Doug's Fat Cat / Doug and Patti P.I. - S3-E1
Other mistake: Doug's Fat Cat: When Doug is filling up Stinky's food bowl, the name on the bowl is misspelled as "Stiniky." When he places the bowl on the floor, the name is spelled correctly. (00:05:37)
Doug's Servitude / Doug Rocks the House - S3-E2
Other mistake: Doug Rocks the House: When Doug tries to talk to Patti at her locker, after he gives the rock and marker back to the kid beside him, the kid's glasses lose their colour for one frame. (00:18:00)
Doug and the Weird Kids / Doug's Behind The Wheel - S3-E6
Other mistake: Doug's Behind the Wheel: When Judy parallel parks the car, as Doug tells her that she just parallel parked, he sticks his hand right through her seatbelt to touch her shoulder. (00:21:51)