Frothing at the mouth (For free!)

https://kaninneko.carrd.co/

Caine discovering the edge of the world, a fake barrier

Disembarking and getting onto land in order to get closer to the exit

Stairs leading up to the exit

Open hand pushing the door open (even though both have visible handles in-scene)

Unexpected reference from Pomni at the very end! Turning up to look at the camera. (Truman smiles and bows, pomni smiles and waves. I zoomed in the first one to show a better match shot, actual shot is below)

Plus the one that may or may not be a reference: Caine in the fetal position as he's recovering from being emotionally ruined as he is pushed towards the edge of the world (and attempts to break free), much like how Truman is thrown overboard, comes back up, and is also curled over before he gets up to try and break free again

The key differences? First off, Caine knows the world is fake and knows there is an exit. he can literally see it. He runs to it, because he knows it exists. Truman doesn't really know yet if there is an exit. The wall has to break before he sees it, but with Caine it's the other way around.

Second, goes back in afterwards. Because he has friends who are valuable to him, he gathers the info he needs, and then returns back to the virtual world. He also already has someone who loves him on the inside, rather than how Truman has someone he is longing for on the outside.

This isn't a difference but instead a commentary - Pomni being the one to look up and wave at the end despite the other references belonging to Caine does make sense. The story starts with her, and in the end she did break free of the cycle that TADC followed before her. She was born in the real world, and now she is living in a different, changed world, that she gets to properly explore and live out. Just like how Truman was born into the fake world and leaves to go into a different and changed world, too.