pokemon prism NPC color glitch?

Known NPCs who share custom player character colors. There are some more in the Battle Tower (which is randomly generated) as well. Code from the source is shown. It appears that it is caused by the ninth argument of person_event being 8.

IntroOutside:
- mom
	person_event SPRITE_MOM, 6, 9, SPRITEMOVEDATA_SPINRANDOM_SLOW, 0, 3, -1, -1, PAL_OW_PLAYER + 8, PERSONTYPE_SCRIPT, 0, MomCampsiteTextScript, -1

CaperCity:
- female who blocks path to route 70 before you talk to Prof. Ilk
	person_event SPRITE_TEACHER, 8, 13, SPRITEMOVEDATA_SPINRANDOM_SLOW, 0, 0, -1, -1, 8, PERSONTYPE_SCRIPT, 0, CaperCityRoute70Block, EVENT_CAPER_SHOVELING_SNOW

HeathVillage:
- blackbelt near the rest house
	person_event SPRITE_BLACK_BELT, 12, 13, SPRITEMOVEDATA_WANDER, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, HeathVillageNPC1, -1
- female cooltrainer near the southwest shore
	person_event SPRITE_COOLTRAINER_F, 31, 6, SPRITEMOVEDATA_STANDING_UP, 0, 0, -1, -1, 8, PERSONTYPE_SCRIPT, 0, HeathVillageNPC4, -1

Route76:
- psychic who wants to battle
	person_event SPRITE_PSYCHIC, 6, 7, SPRITEMOVEDATA_STANDING_LEFT, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 4, Route76_Trainer_2, -1

ToreniaPokecenter:
- guy on right who doesn't have luck with board games
	person_event SPRITE_ROCKER, 3, 9, SPRITEMOVEDATA_WANDER, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, ToreniaPokecenterNPC3, -1

BotanCity:
- guy with hat near train station
	person_event SPRITE_FISHING_GURU, 29, 11, SPRITEMOVEDATA_WALK_LEFT_RIGHT, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, BotanCityNPC2, -1
- guy nearest the mart who says that Pokecenters aren't allowed
	person_event SPRITE_ROCKER, 12, 23, SPRITEMOVEDATA_WALK_LEFT_RIGHT, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, BotanCityNPC3, -1
- guy on right who was a construction worker
	person_event SPRITE_FISHER, 12, 27, SPRITEMOVEDATA_STANDING_DOWN, 0, 0, -1, -1, 8, PERSONTYPE_SCRIPT, 0, BotanCityNPC5, -1
- a youngster who is standing on trees and can only be reached by debug
	person_event SPRITE_YOUNGSTER, 35, 0, SPRITEMOVEDATA_WALK_UP_DOWN, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, BotanCityNPC6, -1
- old guy near west gate
	person_event SPRITE_SAGE, 8, 15, SPRITEMOVEDATA_SPINRANDOM_SLOW, 1, 1, -1, -1, 8, PERSONTYPE_SCRIPT, 0, BotanCityNPC8, -1

DreamSequence:
- some guy
	person_event SPRITE_P0, 25, 25, SPRITEMOVEDATA_00, 0, 0, -1, -1, PAL_OW_PLAYER, PERSONTYPE_SCRIPT, 0, DreamSequenceNPC4, -1

DreamNewBark:
- some palette guy
	person_event SPRITE_PALETTE_PATROLLER, 14, 10, SPRITEMOVEDATA_STANDING_DOWN, 0, 0, -1, -1, PAL_OW_PLAYER + 8, PERSONTYPE_SCRIPT, 0, DreamNewBarkNPC1, -1

Route85:
- psychic near palette patroller
	person_event SPRITE_PSYCHIC, 9, 44, SPRITEMOVEDATA_STANDING_DOWN, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 2, Route85_Trainer_2, -1

AcaniaDocks:
- guy south of gym
	person_event SPRITE_FISHER, 13, 17, SPRITEMOVEDATA_STANDING_DOWN, 0, 0, -1, -1, 8, PERSONTYPE_SCRIPT, 0, AcaniaDocksNPC3, EVENT_ACANIA_DOCKS_NPC_3

Route78:
- female swimmer in the water between two rock faces
	person_event SPRITE_SWIMMER_GIRL, 20, 9, SPRITEMOVEDATA_SPINCLOCKWISE, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 2, Route78_Trainer_3, -1
- female swimmer further south
	person_event SPRITE_SWIMMER_GIRL, 25, 12, SPRITEMOVEDATA_SPINCLOCKWISE, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 3, Route78_Trainer_4, -

Route79:
- birdkeeper looking around
	person_event SPRITE_BIRDKEEPER, 8, 23, SPRITEMOVEDATA_SPINRANDOM_FAST, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 1, Route79_Trainer_2, -1
- cooltrainer looking up
	person_event SPRITE_COOLTRAINER_M, 12, 20, SPRITEMOVEDATA_STANDING_UP, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 4, Route79_Trainer_4, -1

Route84:
- hiker who is last trainer before reaching phlox
	person_event SPRITE_HIKER, 7, 8, SPRITEMOVEDATA_STANDING_RIGHT, 0, 0, -1, -1, 8, PERSONTYPE_TRAINER, 4, Route84_Trainer_4, -1
----------------------

Mom and the two guys in the dream sequence are probably intended to share colors with the player character. However, Mom does not have player character color in the ending scene (RijonLeagueParty), even though the code appears to be:

RijonLeagueParty:
	person_event SPRITE_MOM, 6, 12, SPRITEMOVEDATA_STANDING_LEFT, 0, 0, -1, -1, PAL_OW_PLAYER, PERSONTYPE_SCRIPT, 0, ObjectEvent, -1