Dick's Ark - S6-E12
Character mistake: Sally tells Dick that he's jealous of her gig as a weather girl because he's never been on TV. However, Dick did appear on TV as a panellist on a talk show highlighting Dr. Strudwick's physics book in the season 4 episode Dick vs. Strudwick. Dick ended up turning the show into a Jerry Springer-like fiasco, and Sally even attended the taping. (00:10:40)
Other mistake: When Harry spits baby food on the baby (the camera lens in actuality) in retaliation for the baby spitting food on him and Tommy, Joseph Gordon-Levitt breaks character and laughs uncontrollably and looks at and gestures to off-screen crew members a couple times. (00:06:25)
Tricky Dick - S3-E3
Trivia: Dick's rant about his perceived evils of rock music is identical to Reverend Moore's (also played by John Lithgow) opposition to dancing from the film "Footloose."