Continuity mistake: While Healy and Tucker throw speed at the house, the cucumber slices on the couch move around between shots.
Continuity mistake: When we're introduced to Mary's neighbor sunbathing, the Kool packet next to her changes positions between shots.
Continuity mistake: When Ted confronts Tucker and Healy at Healy's apartment, three piles of dog feces are visible on the floor (next to the door,) when he enters. Several minutes later, when Ted leaves, only one pile is visible.
Factual error: When Magda uses her police scanner to listen to Healy's conversations, she explains it just picks up cellular phones, This is incorrect - in the 90s, police scanners picked up conversations on "cordless" landline phones (in a short range), but not cell phones.
Answer: Because he is ignorant and doesn't know anything about disabled people, he actually doesn't realise what he is saying is offensive.