Continuity mistake: When Howard supposedly has radio sex with that blonde woman, it flashes to other locations where people are listening, including one with police officers standing by early to middle 1990s Ford Crown Victorias. Howard did the stunt in the mid 1980s.
Continuity mistake: When Howard hits Kenny with the phone Kenny's nose is bleeding. It cuts to Howard and then back to Kenny and the blood has disappeared. (01:35:45)
Continuity mistake: When Howard is young and watching the guy break the records, there is a blue coffee cup on the desk. The cup moves from under the microphone to its right. Then it disappears in one shot, but in the next shot he picks it up and throws it. Then after Howard's dad gives the speech to get back on the air, the cup is back under the microphone.
Continuity mistake: Howard comes to Hartford and meets Fred. Watch the Blackfoot Strikes album. First, it's right side up, then opening down, then right again. Fred then picks it up in the upside down position and puts it on the window sill. When Howard sits down it's back on the board, he puts drumsticks on it. Then he puts a clipboard on it. At the end of the scene the album is gone, back on the windowsill.