Mirror Image - August 8, 1953 - S5-E22
Audio problem: During Sam's conversation with the bearded Russian miner, each of them plainly mouths the word "stone," but for some reason, the word is both times dubbed over with "slate." (00:33:10)
Mirror Image - August 8, 1953 - S5-E22
Continuity mistake: When Sam tells Al the bartender that he knows another Al who uses the term "caca," Al leans over toward him to say, "Common expression." The camera angle reverses, and Al is abruptly not leaning any more, but standing back from the bar in his earlier position. (00:16:25)
Nowhere to Run - August 10, 1968 - S5-E4
Factual error: Twice in this episode, characters refer to the Vietnam war being over. But the setting is 1968. The Vietnam war didn't end until 1975. (00:34:20)
Lee Harvey Oswald (1) - October 5, 1957 - November 22, 1963 - S5-E1
Continuity mistake: In the Japanese bar, when Sam takes a drink from the beer bottle, the label is facing him. When Oswald (who is Sam's reflection in the mirror) takes the same drink, the label has rotated several degrees and is facing outward, away from him. (00:28:15)
Mirror Image - August 8, 1953 - S5-E22
Visible crew/equipment: After Sam tells Al the bartender that he wants to talk philosophy, Al tells Sam that he's not just the bartender, he's also the owner, then when Al walks behind the counter the actor's T-mark can be seen on the floor. (00:26:50)
Memphis Melody - July 3, 1954 - S5-E21
Visible crew/equipment: While Sam and Sue Anne are singing Amazing Grace at the diner, right after the shot of the cook starting to play the harmonica, in the next wideshot the actor's T-mark becomes visible on the floor at the bottom, left side of the screen.
A Tale of Two Sweeties - February 25, 1958 - S5-E12
Revealing mistake: Sam's reflection in the mirror near the beginning of the episode drops his handkerchief too quickly after wiping his mouth, making things not match up.
Leaping of the Shrew - September 27, 1956 - S5-E3
Factual error: On the island, Vanessa sees Venus in the sky and it looks very dark. The other shots show the sun is still up so the Venus sighting wouldn't look like that.
Leaping of the Shrew - September 27, 1956 - S5-E3
Continuity mistake: The wide shot of the raft shows clear skies but the closeups are all cloudy.
Leaping of the Shrew - September 27, 1956 - S5-E3
Revealing mistake: The background while Scott is on the raft with Brooke Shields is blatantly a studio wall. The clouds have streaks on them with dark colors and the seam where the ocean meets the wall can be spotted. The film "The Truman Show" used the same technique.
Deliver Us From Evil - March 19, 1966 - S5-E7
Revealing mistake: When Ilia is spurned by Sam, she sits on the bed and rips her clothes. When she goes to scratch her face, you can see the fake blood on her hand when she goes to smear it on her face.
Mirror Image - August 8, 1953 - S5-E22
Other mistake: At the very end of the episode, the last thing to show on the screen are the words "Dr. Sam Becket never returned home." They spelled Beckett wrong.
Goodbye Norma Jean - April 4, 1960 - S5-E18
Factual error: Sam leaps into Marilyn Monroe's chauffeur in April, 1960. But the car he's driving her around in is a 1961 Lincoln Continental convertible. The 1960 had prominent tail fins, the redesigned '61 did not, so the difference is noticeable. This is a model Marilyn could not have purchased until, at the earliest, September of 1960. (00:03:00)
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.