It was noted on Episode #21.26 (1988) that Kelly Zimmerman (Mikki Jamison-Olsen) claims in the film that they have been shipwrecked for 45 days, yet a newsreader on a radio broadcast later gives the number as 35.
Travis and Jesse attempt to hunt muskox, only to have the tables turned on them. Muskox are not native to Alaska, and while some have been reintroduced in recent years, none are anywhere near the Alaska panhandle where the story takes place. Similarly, Kodiak Bears do not inhabit the panhandle, but the Kodiak Archipelago is close enough that this is a minor quibble.
When Jesse (Cjon Damitri Patterson) climbs a tree to escape a bear, the legs of men on the "deserted" island can be seen at the top of the tree, there to help the actor up. The goof was noted and a clip shown on Episode #21.26 (1988).