Cartman throws a stone and breaks a window. A moment later, Stan steps forward and we see his POV - the window is no longer broken.
(At 1:16) Cartman says he is telling his "parents" he staying at Stan's house, but he only has a mom.
A moment after Linda asks, "What is that?," her legs are shown to be blue, but they return to normal color when the toy truck passes by her again.
During the prison scene while the parents are suggesting "other things to do", Stephen Stotch suggests "see a movie". However, his voice is improperly matched with his character's normal voice.
The four boys were not familiar with the word "molest" in this episode and mistook it for "molester". Though in a previous episode (ep. six of season two "The Mexican Staring Frog of Southern Sri Lanka"), Stan falsely accused his uncle Jimbo of molesting him (he pronounced it correctly) during their appearance on Jesus & Pals.