Continuity mistake: The amount of bites out of the slice of pizza Chris is eating changes between shots.
Continuity mistake: When Chris is talking to Jon Favreau in his hotel room, Chris leans across Jon and grabs a pad from the end table next to him. In the next shot the pad is on the table again, then disappears.
Answer: Yup, just like Nicholas Lea was chosen to play Alex Krycek on the X-files after showing up on 1 episode as a different character.
Grumpy Scot