Hobie's age (ten-and-a-half, almost eleven) is established in this episode. Direct quotes from the first season gave his age as twelve, and later thirteen.
Towards the end of the episode when Mitch has to save his nephew from under the pier, the piers are all vertical, fairly new and smooth concrete, yet in every long shot from beginning to end show that the outer piers are angled, nearly all of them are worn, damaged and encrusted with barnacles etc.
When Eddie talks to Hobie and Kyle and says, "Why don't you give a little instead of taking all the time?" he clasps his fingers together. In the next shot, his hands hang loose.