Disco Inferno - April 1, 1976 - S2-E2
Factual error: In this episode that takes place in April of 1976, everyone sits around watching an episode of Saturday Night Live with Bill Murray on it. Murray didn't join the cast until 1977.
Disco Inferno - April 1, 1976 - S2-E2
Audio problem: When Sam says "I'd rather be dead," his lips don't move in sync with the words. (00:01:35)
Disco Inferno - April 1, 1976 - S2-E2
Audio problem: When Chris is performing, and we see his dad watching, one of the scenes has poor audio sync. The music is ahead of his singing.
Disco Inferno - April 1, 1976 - S2-E2
Continuity mistake: Sam is buttoning up his shirt while at the bar. His hands are about halfway down his shirt. Cut and we see him from another angle. His hands are now down.
Disco Inferno - April 1, 1976 - S2-E2
Factual error: The episode takes place April 1, 1976, and Sam performs a stunt for the "Earthquake" movie featuring Charlton Heston, but Earthquake was released in 1974, so was filmed long before 1976.
Answer: Sam threw items off the raft to lighten the load, so it wouldn't sink, in doing so he made the raft less heavy. Which made easier to float with the currents, if it was heavy the raft would have moved slower and not moved so far.
Except that Al said that immediately after throwing stuff out of the boat four hours passed and it was shown that they didn't really move from where they were. They were still in the same spot. Forgot to ask this too. When Sam and Vanessa are stranded on the island, one of them, can't remember who, did something and when Al appears, he tells them that because of it, time had suddenly skipped several more hours and if the event hadn't been interrupted, they would have been rescued by a boat. So, what happened on the island that once again caused time to speed up? It seems kind of strange that time could move so quickly on the island, especially since it was still day time and it never showed any sort of changes like the sun or clouds moving.