Goofs

In the beginning Bonnie pushes Buzz and Jessie down a mountain on a sled, and 6 seconds later we see Jessie is covered in Styrofoam peanuts across the room. Jessie couldn't have gotten over there without Bonnie seeing her.

Just like in Toy Story, the fanfare doesn't play when Buzz's button is pushed.

When Rex grabbed Woody and Buzz, Woody's hat didn't fall off, even though he was upside down. However, his hat almost fell off when The Cleric was forcing Rex to drop him and Buzz in the Pit.

It's unknown why Mason's father didn't convince him to play with his new toys instead of his video games.

The Cleric gives a thumb down signal known as "Pollice verso". Whether this is actually the correct signal to seal the fate of a gladiator after combat is the subject of much debate.