Continuity mistake: When Larry and Richard listen to the recording of the phone conversation between Bernie and Paulie, there is a slight difference to when they had the conversation live. After Bernie told Paulie where his house is located, Paulie replied with "Uh huh" which is not heard on the recording. (00:29:05 - 01:04:45)
Continuity mistake: After Larry and Richard put Bernie on the couch, his legs are uncrossed as Richard notices the stuff falling out of his pocket. But, when he says that Bernie is dead, Bernie's legs are crossed when Larry walks back over to the couch. If he's dead, that shouldn't happen, since the guys obviously didn't pose him like that.
Continuity mistake: When Larry and Richard arrive at Bernie's house and talk to the lifeguard out the front, there is only sand leading up to the house. Later when Richard leaves the party and runs onto the beach to see Gwen, and at the end when Bernie is being taken away by ambulance, there is now a wooden walkway leading down onto the sand.
Audio problem: At the beginning when Larry and Richard come into the building, the security guard asks Larry if it's hot enough, and we hear a reply. But their lips don't match what they said and, for the most part, neither are actually seen talking. Plus, it sounds like Richard (Jonathan Silverman) who replies.
Audio problem: After Bernie falls off the back of the boat, he hits the channel markers as they go past, ringing the bells at the top. The boat passes the last one, but the ring of the bell is too early. It took a second or two after passing for a bell to be rung for the previous markers. However, for the last one, it rings just as soon as they pass it. There aren't any other rings after that.
Other mistake: When the hitman returns to kill Bernie for the last time, he shoots Bernie six times and the revolver is empty as expected. When he pulls out his other .38 revolver to shoot the witnesses, he shoots seven times even though .38 revolvers can only have six bullets. (01:29:00 - 01:32:00)
Audio problem: After missing the boat (when their shoelaces are tied to Bernie's), Larry and Richard start arguing. At one paint, Larry says, "Why can't you be a lazy shit like I am?" However, his lips seem to say, "Why can't you be a lazy fuck like I am?"