Doug Takes the Case / Doug's Secret Song - S2-E1
Audio problem: Around 3 and a half minutes into the episode, Doug, as the Chameleon, says he has a good idea as to who would've taken BeeBe's radio. The end of this sentence is very unnaturally pitched up.
Doug Takes the Case / Doug's Secret Song - S2-E1
Other mistake: The framing of this entire episode is such that the edge of the animation cels is visible. Noted on Paramount+.
Doug's Derby Dilemma / Doug's On His Own - S2-E6
Continuity mistake: Doug's On His Own: When Doug talks to Skeeter on the phone, as he says, "Well, at least our phones are working," the 0 button on his phone is missing. In the next shot of the phone, the button is back. (00:18:13)
Doug's Lost Weekend / Doug's Lucky Hat - S2-E13
Other mistake: Doug's Lost Weekend: When Doug is walking inside Computer Junkie at the beginning, notice how the "J" in "Junkie" on the glass rotates a little to the left mid-shot. (00:01:43)