I'm of the opinion that Easter Egg questions are like any other kind of questions: some of them are good, some of them are not.
As a general rule, Easter Egg questions fall under "Behind-the-scenes" information, something that is firmly on-topic. Normal rules for broadness, listiness, and opinion-based questions still apply, as they always should.
Of course the general topic of Easter Eggs rather lends itself to "Validate my fan theory" questions, which must be considered carefully
I'm personally not fussed about any of those questions. I get very nervous whenever the solution to a list question is "make a CW post and let everyone add in their pet examples." That smacks rather strongly of TVTropes' There's No Such Thing as Notability1 rule, which to my mind is the opposite of what SE aims to do.
Specifically regarding broadness, though.
General site consensus is that finite, well-scoped list questions are okay. Obviously The Force Awakens is finite. So in one sense, any question about things The Force Awakens uses for inspiration will also be finite, just because there's a limit to the number of things that can be influenced.
The issue, at least for me, comes from the other end of the question. Looking at the examples:
A New Hope also finite, and fairly well-scoped. It's a single movie. Moving on
Star Wars movies, but not A New Hope. Still finite; only five movies (six if you count The Clone Wars movie). Scope is getting a little harder to justify, but it's still a finite list
So, I VTC'd this question. The reason I did so is because, at the time, the OP hadn't placed any limits on what the Easter Eggs were referring to, effectively asking for "all references to any other piece of media, ever." That's not merely the Star Wars franchise; that's all human creative output.
Your edit, by the way, made it rather better by imposing some kind of reasonable limit (namely, intent of the production crew). Now that it only requires knowledge of all JJ Abrams and Lawrence Kasdan interviews, I have VTRO'd
1 TVTropes link (duh). It's dangerous to go alone.