Trivia: When Bolt threatens to drop Mittens from the overpass unless she tells him where Penny is, the bus from Speed (1994/I, with 2525 on the roof) passes underneath.

* Miley Cyrus was not the first choice for Penny. Chloe Moretz voiced the entire film before Miley was placed on the project.

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Mistakes:
Continuity: Near the beginning of the film, Calico is sitting with a cat on his right shoulder. Their reflection is shown in the glasses of a man directly opposite. The reflection shows Calico and the cat in the same position instead of being reversed, as a reflection would be.

Continuity: When the man hears barks coming from the shipping box Bolt is in, he takes a knife and slices a line through the tape that goes across the top of the box. Then the next shot shows all the tape sliced.

Continuity: Penny pours dog food onto a bowl for Bolt and places it next a pillow. Cut to Penny trying to get Bolt to play with his toys and a bone design has appeared on the bowl. It's too fast for Penny to turn the bowl around.

Continuity: Towards the end of the film when Penny takes one last picture, Mittens is lying against the mother's lap. But at the very end when you see the photo, Mittens is sitting up and posing.


Continuity: Near the beginning of the film, Calico is sitting with a cat on his right shoulder. Their reflection is shown in the glasses of a man directly opposite. The reflection shows Calico and the cat in the same position instead of being reversed, as a reflection would be.

Continuity: When the man hears barks coming from the shipping box Bolt is in, he takes a knife and slices a line through the tape that goes across the top of the box. Then the next shot shows all the tape sliced.