Traci Paige Johnson, Michael Rubin (under the stage name Seth O'Hickory), and LaNae Allen do not receive any credit whatsoever for their roles as Blue, Mailbox, and Sidetable, respectively. Plus, Cody Ross Pitts is credited as Cody Pitts.
After Steve draws the third clue (a pillow), the pawprint is still seen on the pillow.
Blue suddenly appears and somehow sneezes when Steve sneezes, but she wasn't in the way of Steve's cleaning up.
When Tickety jumps up right before she breaks apart, her eyes briefly disappear for a few frames and then reappear.