Visible crew/equipment: After Bob urges Alpine not to merge, when Carl flips Todd there is a huge straight edge shadow where they stand, however, there is absolutely nothing near the seated people that would cause such a shadow - only the crew's equipment. (Even more noticeable on fullscreen DVD.) (01:29:20)
Continuity mistake: When bike riding Bob chases down the Gornicke bus, in the front shots their shadows jump from their right to left between shots, while driving in a straight line. (01:22:15)
Continuity mistake: After being snubbed by Carl and Cassie, when Bob walks into the kitchen as Jamie speaks to her sister, the chopper jumps to the other side of the butcher block cutting board, and the chair beside the laptop turns by itself, etc. in following shots. (00:06:30)
Continuity mistake: Bob tosses the stink bomb canister through the open door, towards the back of the RV, but the smoke cloud appears in two different areas; it expands at the sink window and at the front passenger window, with clear air seen in between through the door. (00:50:15)
Continuity mistake: When Bob drives up Diablo Pass and also when the RV teeters on the mountain, in the exterior shots the back curtains are closed, but in the interior shots they are wide open. (01:10:40)
Answer: In the world of "make believe", they used "movie magic" to zap the RV out of the water and on to dry land - with no mechanical issues resulting from being submerged. In the real world, someone called a tow truck - perhaps AAA - and the RV was pulled out of the water and it suffered water damage and needed some repairs. This movie was presented as being "real life." Bob left on a bicycle to "try to find help." Near the end of the movie, Carl said that the RV "spent two days under water and they had to fish it out." He didn't say who "they" were. A fishing pole would not be strong enough to reel in a large RV, so I think it is safe to conclude that a tow truck was used to pull the RV out of the lake.
KeyZOid
It should be noted that "fish it out" is a common phrase to mean pull or take out, especially after searching. When people use the term, they're never taking about using a fishing pole. But often when people post questions like this, they're asking for an in-film explanation in case they missed (or didn't understand) something. If no in-film explanation was given, a reasonable speculation can be given. You don't need to remind people the movie is a movie. If the in/film explanation is uncharacteristic to real life, then one can point out that in real life it wouldn't happen that way.
Bishop73
It was meant to be ironic.
KeyZOid
There was no irony, but this isn't the forum for irony anyways.
Bishop73
I guess I failed miserably... but wasn't the original question rhetorical?
KeyZOid