Possible goof.
In the opening scene of the film we see Harry fiddling with his nifty spin cast combo. (Which a SERIOUS fisherman probably wouldn't mess with) Later we see the daughter fishing with what appears to be string tied to a home made pole. We never see it well enought to know for sure, but any rig you can cast & retreive is a hundred more times effective than the branch, handline, bobber, combination.