Xenoblade save, quest and party change notes

There is a double cutscene right after you defeat the mechon on Sword Valley with Dunban.

Colony 9 + Tephra Cave
After the Colony 9 area cutscene is a party change.
After the lab cutscene is a party change.
After the party change is a quest.
After the cutscene at Outlook Park there is a party change.
After the party change is a quest.
After the 2nd cutscene in the lab is a party change.
After the cutscene at Tephra Cave Entrance is a party change.
After the cutscene from killing the Ancient Machines is a save.
After the cutscene at the Main Entrance of Colony 9 being attacked is a party change.
After killing the Mechon M63 is a party change.
After the 1st cutscene at the Central Plaza is a party change.
After the 2nd cutscene at the Central Plaza is a party change.
After the cutscene at the Main Entrance is a party change.
After the 2nd cutscene with Metal Face is a save.
After the cutscene after the save is a party change.
After the cutscene after the arachnos is a party change.
Right before the Arachno Queen is a party change.
After the cutscene after killing the Arachno Queen is an item.
After getting to Kneecap Hill is a save.

Bionis Leg
After killing the Arduns and skipping the cutscene is a party change.
After getting to the Refugee Camp is a party change.
After talking to Sharla and skipping the cutscene is a party change.
After the cutscene after meeting Xord is a save.

Colony 6 + Ether Mine
After Otharon leaves, but not after he joins is a party change.
After beating Xord at the bottom level of the Ether Mine is a party change.
After the party change is an item.
After defeating Xord for the last time is a party change.
After the cutscene outside the Ether Mine is a save.
After the cutscene after the save is a party change.

Satorl Marsh
After the cutscene at the Sororal Statues is a party change.

Makna Forest + Frontier Village
There is a save right after getting to Makna Forest, but this one is unique in that it has no cutscene after.
After the cutscene at the contaminated area there is a party change.
After the party change there is a quest.
After getting the item orb at the Lakeside is a quest.
Upon entering Frontier Village there is a party change.
After getting to Melia there is a party change.
After going down to the Sacred Altar there is a quest.
After getting Riki there is a party change.
Before fighting the Leone Telethia is a party change.
After coming back to Frontier Village there is a party change.
After getting Melia back again there is a party change.
After the cutscene at Apex lake is a save.

Eryth Sea + Alcomoth + High Entia Tomb
After getting to the Centre Gate is a party change.
After the cutscene in the Audience Chamber with Melia is a party change.
After talking to your party is a party change.
After the party change is a quest.
After saving the worker is a quest.
After killing the assassins in the Whitewing Palace is a party change.
After reaching the High Entia Tomb is a party change.
After reaching the Ceremony Hall with Melia is a party change.
After reaching the Ceremony Hall with Shulk's party is a party change.

Between High Entia Tomb and Valak Mountain
After defeating Tyrea and Solidum Telethia is a party change.
After reaching the Audience Chamber with Shulk is a save.
After getting Melia back at the Imperial Villa is a party change.
After leaving Alcomoth manually are two quests.
After activating the switch on Soltnar Seal Island is a quest.
After activating the switch on Central Seal Island is a quest.
Before fighting Metal Face is a party change.
After beating Metal Face is a save.
After the save is a party change.
After talking to Dunban is another party change.
After the last cutscene in the audience chamber is a party change.

Valak Mountain
After the cutscene at Harict Chapel is a quest.
After defeating Conflagrant Raxeal is an item.
After melting the ice at Harict Chapel is a quest.
Before fighting Mumkhar is a party change.
After fighting Mumkhar is a save.

Sword Valley
After talking to Dickson is a party change.
Right beside Enalda Control Base is a quest.
Right before battling Mumkhar again is a party change.

Galahad Fortress
After the Galahad Fortress area cutscene is a quest.
After killing Sentinel Mechon is an item.
After activating the Lift Activation Device is a quest.
After getting to the Main Control Room are two quests.
After activating the second switch is a quest.
After activating the switch in the Piston Control Room is a quest.
After reaching the Face Maintenance Bay is a quest.
After defeating the mechon beside Fiora is a quest.
After getting blown back by Gold Face is a save.

Fallen Arm
As soon as you appear on Fallen Arm there is a party change.
After the cutscene at the Silver Wreckage is a quest.
After getting the item orb at Zakt Spring is a quest.
After the quest is a party change.
After the party change is another quest.
After reaching Ulna Passage is another party change.
After switching to Reyn is another party change.
Before fighting the two flying mechon is a party change.
After fighting them is another party change.
After the cutscene with Shulk's party is another party change.
After reaching the Hidden Machina Village is another party change.
After the party change is a quest.
After talking to Linada is another party change.
After meeting Miqol is a save.
After the save is a quest.
After returning to Linada is a quest.
After resting is a party change.
After the party change is an item.

Mechonis Field
After getting to 2nd Lift – GF is a quest.
After activating the GF Main Power Switch is a quest.
After activating the switch at the 3rd Life Engine room is a quest.
After hitting the second switch at the 3F Main Power Switch is a quest.
After hitting the switch in Power Supply Area 2 is a quest.
After hitting the 4F Main Power Switch is a quest.
Before fighting Jade Face is a party change.
After fighting Jade Face is a save.
After the save is a party change.

Central Factory
After the Central Factory area cutscene is a quest.
After hitting the switch in the Control Tower is a quest.
After the Central Warehouse Lift is a quest.
After approaching the Factory Vent is a quest.
After killing the M88 Watchtower is an item.
After killing the Offensive Scout is an item.
After killing the M97 Commander is an item.
After getting the last item is a quest.
After blowing up the vent is a quest.
In the Mechon Factory is a quest.
At the Tower Boarding Gate is a quest.
After reaching the Agniratha Transporter is a quest.

Agniratha + Central Factory Revisit + Mechonis Core
After the cutscene at the Data Centre is a party change.
After the party change are two quests.
After hitting all 4 switches is a quest.
After warping back to Shrine Transporter is a quest.
Before fighting Gadolt is a party change.
Before fighting Egil is a party change.
After fighting Yaldabaoth is a save.
After the save is a party change.
After landing back in the Central Factory is a party change.
After fighting the Apocrypha Generator is a party change.
After the vision at the Mechonis Core is a quest.
After destroying all three cores is a quest.
After the quest is a save.
After fighting Zanza is a party change.

Junks + Colony 6 + Bionis Interior
Aboard Junks there is a party change.
After battling the Sureny Telethia on Junks is a save.
After the save is a party change.
After the cutscene with Fiora is a party change.
Before the fight with the three telethia is a party change.
Before the fight with the Sureny Telethia is a party change.

Prison Island
After killing Demon Pavlovsk is a quest.
After reaching the Silent Corridor is a quest.
After killing Dragon King Alcar is an item.
After inserting the item is a quest.