Audio problem: When Dodge and Jackson go outside to put the spotlight on the periscope, Jackson climbs up. He sings the Army theme, be all you can be. You hear Dodge say that's the army not the navy, but if you look at him when he says this, he doesn't even open his mouth.
Down Periscope (1996)
1 audio problem - chronological order
Directed by: David S. Ward
Starring: Bruce Dern, Kelsey Grammer, Rip Torn, Rob Schneider, Harry Dean Stanton, Lauren Holly
Genres: Comedy
Continuity mistake: When they are attempting to get "between the screws" of the tanker, the underwater footage shows twin screws, but the surface footage only shows wake from 1 single mid-ship propeller.
Sonar: Sir, it's the Orlando. Somebody just dropped forty-five cents.
Dodge: Are you sure?
Sonar: Oh, yeah. A quarter and...two dimes.
Trivia: In the scene when Lauren Holly, gives Kelsey Grammer, a kiss, her hitting her elbow was not in the original script. She really did hit her "funny bone" before walking off camera. The director had decided to keep it in the movie so they had to film an alternate shot of Grammer, laughing when it happened.
Question: Would pouring whiskey into the tank have really thinned down the mix, giving the submarine more speed?
Answer: Adding alcohol to gasoline can lower the fuel's viscosity, thinning it to flow more easily. It can only marginally increase an engine's speed and power.
raywest ★
But the question was, would it have actually increased the sub's speed?
Thinning the fuel mix would not increase energy or performance, so it would not make the submarine faster.
Technically, yes, diesel with alcohol burns better. As for what happened in the movie: no. Whiskey is not alcohol; it's water with alcohol, and the water reduces the flammability a lot. Also, a sub has fuel tanks that hold tens of thousands of gallons; adding a few ounces of whiskey will not have any effect at all.