Corrected entry: When Indy and company arrived at the temple containing the Crystal Skulls, they needed the key to access the stairs leading down to the temple (or whatever it was). As they descended the stairs, the steps disappeared into the wall, and they fell into the water but stayed perfectly dry. So, how did the bad guys get down with no stairs or other visible means, and also appear dry in their next scene?
Correction: The well-equipped Soviets could have used ropes to descend to the temple's entrance, which would also allow them to remain dry. As to Indy and company falling into the water and then reappearing dry inside the temple, that is a separate mistake which has already been noted.
raywest ★