Sil is in the process of removing the swimwear from the "hot tub guy" when the good guys show up to get her. But after she notices they arrived for her, the swim short on the guy seems to have been pulled back up to the guy's waist.
When Preston Lennox (Michael Madsen) and Dr. Laura Baker (Marg Helgenberger) are kissing while she's leaning against the door to her hotel room, her bathroom can be seen through a doorway to her left. At the same time, Sil (Natasha Henstridge) is shown in the hallway listening at the door. To *her* left (both characters are facing the same direction, they're just on opposite sides of the same door) is the door to another hotel room, instead of a wall that the bathroom would be on the other side of.
The Porter on the train is a rather large lady. Yet her uniform almost perfectly fits Sil when she leaves the train.
Correction: The conductor's uniform is actually a very bad fit on Sil, just as the coat she takes from her first lover. And the clothes she initially steals before the cocoon. Besides limited choices, Sil doesn't really understand how to dress - only that she's covered.
The conductor gets half-sucked into the cocoon, resulting in her death. Sil later emerges from the messy cocoon, covered with its fluid and falling right on top of the conductor. But when Sil dons the conductor's clothes, they are spotless.
When Sil ditches the BMW, a police officer finds it later and looks inside. It appears to be out of gas, but the fuel gauge goes from R to F instead of E to F. However, fuel gauges on BMWs (like most European brands) are labeled "R" for "Refuel" to warn when the gas tank is depleted. Gauges bearing "E" for "Empty" are customary on American and Japanese marques.