Fate/Zero Callbacks in UBW Anime

Just a nice little list I decided to conjure up. To clarify unlike the VN UBW has a lot of anime original stuff here that wasn't in the VN due to when it was written so the anime does add small subtile call backs to Zero.
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The next-episode previews are done in the exact same style as Fate/Zero.

Rin was supposed to use the same relic her father used in the Servant invocation, but it has broken apart.

Illya uses birdlike familiars similar to her mother's.

The hand-holding motif of the second opening of Fate/Zero returns in the opening.

After Shirou tells Saber who he is, Saber looks surprised to hear the name Emiya, before looking back at the shed in mild surprise.

Remember the magic circle Irisviel drew in that shed? It's the same one Shirou unwittingly uses to summon Saber.

Even the way scenes are directed are very deliberate callbacks to Fate/Zero, just look at this! (The scene in which Tokiomi and Risei circle around Kirei as they explain the grail war to him, in UBW Kirei does this exact same thing to Shirou, amusing due to the two's similarities at the beginning of their respective grail wars.)

Saber looks away and shifts uncomfortably when Illyasviel, the spitting image of Irisviel, first introduces herself.

During Saber's fight with Lancer, Lancer uses Gae Bolg and hits her. As she recovers, Saber questions if the attack was a curse before instead realizing what it really is, a clever nod to what happened to her when she fought the Lancer in the fouth Grail War.

During his fight against Caster, Archer recognizes one of her spells as a form of Innate Time Control, Kiritsugu's signature magecraft.
In the second opening, Lancer is in the same building that Kayneth and Diarmund used as their last hideout.

When debating to allow Shirou and Rin entrance to the Einzbern's manor, Illya briefly recalls the last day she saw Kiritsugu.

The place where Shinji and Gilgamesh appear at the Einzbern's villa is the same courtyard where the meeting between the three kings occurred.

A series of flashbacks show that sludge from the corrupted Grail took on Irisviel's form (the body it was last in) and fed Illya lies about Kiritsugu to make her hate him.

Episode 19 briefly flashes back to Rin's last moments with her father and the moment of Kirei giving her the Azoth dagger, both from Fate/Zero.

Episode 20 shows us again Shirou struggling and walking forward to survive the hellfire at the end of the Fourth Grail War, as well as Kiritsugu finding him and giving him Avalon to survive.

Again in that same episode: at the end, Archer hurls his swords at Shirou and the camera spins 360 degrees as it follows their flight path, an exact copy of the camera work in Episode 24 of Fate/Zero when Kotomine throws his Black Keys at Kiritsugu.

Episode 21 flashes back to another scene from Fate/Zero, the moment when Saber destroys the Grail with Excalibur, causing the corrupted mana within it to spill all over Gilgamesh and burn down part of Fuyuki City.

Episode 22 shows the epilogue of Fate/Zero from Rin's perspective and a scene that features in Heaven's Feel, her memories of seeing Shirou jumping a high bar until sunset. It also has a Tohsaka walking around in circles during an explanation.

Episode 23 has Gilgamesh summon his sword Ea using the same key and unlocking mechanism from Episode 23 of Fate/Zero.

In that same episode, Shirou's first move when countering the full might of the Gate of Babylon is to pivot and grab a sword in the exact same way that Lancelot did when fighting Gilgamesh for the first time.

In the final episode, Shirou has a brief conversation with Lord El-Melloi II a.k.a. Waver Velvet about the Holy Grail War and his ideals.