Doug's Fat Cat / Doug and Patti P.I. - S3-E1
Revealing mistake: Doug's Fat Cat: When Doug imagines himself reporting Stinky on the phone, when Stinky is chasing Porkchop, her tail is layered over the wall in front of her. (00:02:15)
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 Fat Cat / Doug and Patti P.I. - S3-E1
Revealing mistake: Doug's Fat Cat: After Stinky is revealed to be a mother, there is a shot of two of the kittens playing with each other. The two kittens keep turning into the opposite kitten repeatedly (you can tell because they keep flashing opposite colors), indicating that the animation is simply looped over and over. (00:11:14)
Doug's Fat Cat / Doug and Patti P.I. - S3-E1
Continuity mistake: Doug and Patti P.I.: When Doug and Patti tackle Skeeter, they pin him down, and Patti's hands are on the left side of his chest, and Doug's hands are on the right. In the close-up of Skeeter, their hands have switched sides; then go back to normal in the next shot. (00:20:03)