The "Lake House" is actually the cabin used in the film The Great Outdoors (1988). It is located on the Universal Studios back lot.
Jake mentions a PokémonGo Community Event Weekend. The weekend that corresponds with this episode's original release did, in fact, have a Community Event. It was for Eevee.
The episode centers on Holt and Kevin owning a "lake house." In an early episode Holt tells Jake that not all adults own lake houses but Holt's Lake house is not in fact on a lake and thus not really a lake house. Holt and Kevin named it after an obscure poet named Lake.
Preempted in the Washington, D.C. and Boston area due to a Washington Football Team/New England Patriots pre-season football game. In the D.C. area, the episode aired on the COZI NBC digital subchannel.