Last Dance Before An Execution - May 12, 1971 - S3-E19
Continuity mistake: When Sam is strapped into the electric chair, the huge clock on the wall behind him, which is there so that both the prison doctor and the reporters viewing the execution can mark the time of death, reads 7:00. The final scene runs for more than five minutes - after which the clock still reads 7:00. (00:37:15 - 00:42:00)
Last Dance Before An Execution - May 12, 1971 - S3-E19
Continuity mistake: As Sam is marched down the corridor to the electric chair, Raul reaches through the cell bars and begs him to confess. In long shots, Raul's arms are fully extended. But in close-ups, his arms are folded and wrapped around the bars. (00:38:30)
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.