why wouldn't Mr. Ripley be able to do the docking procedure properly? Wasn't he the leader of the whole Lazarus expedition and ergo, the most experienced?

the explanation for the 5th dimension Cooper used to contact Murphy. At the time I figured Amelia moved further along in time and the colonies were responsible for it but her last scene pretty much ruled that out. Perhaps it would have been better off not being explained and being viewed as just a function of the black hole itself?

was it ever explained exactly what it was Murphy did to save humanity? I'm sure it was inferred, but I feel I never got an answer.

1. It was humans. Time is relative. Or something like that. In the same way he was able to leave a message for his daughter, humans in the future were able to communicate with Coop.

2. Damon was worried about surviving. He left false information, hoping that NASA would come to save him.

3. Yes, he could communicate, but could not cross over.

4. Caine was so duplicitous about Plan A because he knew wasn't able to reconcile his plan and was certain there would be no way to save the people on Earth. It'd be near-impossible to find qualified people and convince them to leave their families forever.

5. Morse code. He could have been there for hours or days.

6. Future humans collapsed the time-dimensional rift-thing and sent him back to Saturn through a wormhole. The highly Saturn space station (or Cooper Station) was apparently developed to stay near the opened wormhole.

7. Hathaway's character found the research station on the habitable planet. Time is moving much slower on her planet. 75-or-whatever years went by on Earth/Coop Station. It appeared that only hours or days went by where she was at. They will now have the details and colonize the planet. Coop went at the end to meet with her.

Yup. Humans that had evolved into the fifth dimensional beings - we can't perceive them so it wouldn't make any sense to show them. Arguable plothole in how they evolved to that point but since time is seen as an object, arguably modifiable objects in the past can change things and the plague destroying their crops likely came from it.

Damon thought he was ready to give up his life, but decided not really. He wanted to survive and knew he would be lynched if it got back that he was sending "Thumbs Up" and faking data to get people to scoop him up.

afaik, the data Coop sent to his daughter is what the data TARS processed/interpreted by entering the black hole. Which explained how gravity could be used to their benefit and get the massive ship launched to the wormhole.

Hathaway found the inhabitable planet. Coop and her aged at the same rate, and they're both about 90 years older than they were on Earth at this point. She located where humans will ultimately live (if she is the one that setup camp, could have already been there. But her walking around with her helmet off means it had a livable atmosphere.) I may have missed the detail as to how life was sustained on the space station.

You can definitely call out bullshit that Coop entered a black hole and came out at roughly the same time he went in.