In no particular order:

1. How in god's name do 23 years go by on the first planet? They were down there, like, half an hour, tops. I know TARS (or maybe it was CASE) makes some comment about "forty five minutes to an hour", but they only seem to have the one conversation before starting the engines up again, and it doesn't seem like movie time should apply. Even if we graciously give them the hour, it still only should have been seven years, maybe twelve if you consider time was slowing as they got closer to the planet. Mostly feels like they only made it 23 years so that Mackenzie Foy could grow up into Jessica Chastain, but it would have been nice if they'd given us a believable scenario that made that happen, not magically pretending that one hour (tops) was actually more than three.

2. Why did they need the rocket to launch off of Earth the first time? The Endurance was already waiting for them up there, and the Ranger spends the entire movie taking off from the surface of planet's thereafter. I'm fine with them having the level of technology necessary to accomplish such a feat, I'm just not sure why they needed the rocket if they have this capability.

3. Back to the first planet, how come none of these super smart scientists were able to figure out that even after twenty years had gone by for them, only about three hours had gone by for Miller? Surely such a crucial detail should have been part of their discussion on deciding which planet to visit first, yes? For that matter, why was Miller even giving the thumbs up ping if she'd only been on the planet for a few hours? Maybe she pulled the same shenanigans as Matt Damon did later in the film, but I think the audience could have benefited from a bit more clarity here.

4. Okay, so they solved the gravity equation back on Earth. The human race is saved. Except that when Cooper returns, like, sixty-ish years later (guessing based on his daughter's age), apparently no one has gone through the wormhole to find Brand/Wolfe's planet yet? So what have we been doing for the last half century? Building a space station around Saturn? I know they make a couple of references to Earth's population being depleted and in need of replenishment, but surely not everyone from Earth is living on that space station. Just why the hell has no one followed up on this wormhole thing in six decades?

Granted, I've only seen the film the once, and it was just a couple of days ago, so maybe some of these have answers, but they stand out as very glaring logical flaws in an otherwise well constructed film. I guess that's kind of par for the course on a Nolan film though, sacrificing character sensibility and plot cohesiveness for the sake of emotional impact.