I have not seen the episode yet.
Some game stuff that does not go beyond the plot of Tommy's town/place:
In the game Tommy clearly does not want anything to do with the fireflies. And in the game, up until this point, there are much more human conflicts going on, making it clear why you don't want to broadcast/search contact for anything. Furthermore, the Firefly locations and existence are all hearsay. They are kind of an extremist group and do not have a clear open presence (see first episode, where they bomb shit and try to recruit Joel in a cryptic way). I'd say a good chunk of the game is searching for locations/clues where to find the fireflies next. The original base where they were supposed to drop Ellie was completely massacred, after all (in the game this was done by humans, not infected). Also, in the game Tommy's town is under attack shortly after you arrive, so they have different priorities.
I am curious to see how they adapted it, but will likely save up this episode for a longer session