By the radio on Jim's boat is a bottle with a boat in it and the cork in the bottle is pointing to the left side. When Suzi gets up to check on the noise, the bottle is visible and the cork is now pointing to the right side.
Jensen Daggett was genuinely terrified when actor Kane Hodder pulled her towards him, through the porthole. This is because a huge shard of glass was right by her throat and Kane was unknowingly pulling her toward it. You can see the frightened look on her face.