Continuity mistake: In the final wedding scene in the tent, both the father of the bride and the father of the groom walk in looking fresh and dry, not looking at all like they had just hopped off a jetski and been hit with a large wave.
Continuity mistake: Near the end at the wedding scene Michael Douglas is seen arriving wearing a tie that has the world's greatest knot in my opinion. Throughout the next few minutes you will see the knot get worse and then back to the original.
Chosen answer: Designs of torpedoes dating back to before World War Two were generally capable of exceeding thirty knots, with many current designs easily doubling that and, in certain cases, reaching well into three-figure territory. The Juliet-class torpedo appears to be fictional, but, given the performance figures for real life designs, a speed of thirty knots seems actually quite slow.
Tailkinker