Continuity: In the episode where Al must joust for his life, his football jersey changes numbers from 33, to 27, back to 33.
Continuity: In episode 5, "Have You Driven a Ford Lately", while Peg and Marcy are eating salads, they are originally drinking from cans in "coolies" (blue styrofoam holders). In the middle of Peg's sentence the scene cuts and shows they are drinking dark liquids from regular glasses.
Revealing mistakes: In the episode, "You Better Shop Around", Al rolls a turkey on the ground to knock Jefferson and Marcy down. Jefferson's harness is visible.
Errors made by characters (possibly deliberate errors by the filmmakers): On the register in the shoe store, Visa is misspelled as Vista (this may have been deliberate, however, to avoid infringing on copyrights.)
Continuity: The number on the front of their house changes from 9764 to 9674 in some episodes. Their 'official' address is 9764 Jeopardy Lane, as seen on the address label when sending clothing from the UK, in the 'England Show' episode.