Possibly unintentional, but Hit is another word for wanting to have sex with someone, so in a sense, Lisa WAS telling the truth when she said Johnny "hit" her.
Definitely unintentional, otherwise we're crediting Lisa more intelligence than she has.
It would also make the whole thing a lot, lot more devious, as implying that Johnny "Hit" her after drinking may have been Lisa trying to invoke Rape as Drama, which would then make Claudette shutting Lisa down with "Johnny doesn't drink." incredibly hilarious!
Mark tries to pressure Johnny into telling him confidential information from his work. Johnny then follows up by asking: "How's your sex life?" Though it seems like a non sequitur, Johnny is trying to show Mark how he is making him feel in requesting personal 'confidential' information.
Wow, that would be pure genius if anything else in that movie indicated that Johnny was capable of that level of subtlety.
I occasionally wondered, in lieu of Johnny's "Maybe I know more than you think I do" line later on in the film, if this wasn't perhaps supposed to be a ham-handed hint that Johnny suspects Mark's banging his fiancee. But, of course, that would be implying that Tommy Wiseau is capable of subtlety.
I think Johnny was completely oblivious to what was going on throughout the film. He seems to be shocked at the end when he listens to his perpetually-recording cassette tape of Lisa and Mark's phone conversation and discovers their affair. He even asks Lisa who she's talking to beforehand. Of course, this can also just be Hand Waved by viewing it as Tommy Wiseau's ineptitude rearing its ugly head.
Lisa tells her mother that Johnny got drunk and hit her, and Claudette replies "Johnny doesn't drink!", making it look like she only cares about the least important of the two. But it makes sense if you look at it like this: if, as far as Claudette knows, Johnny really doesn't drink, then Lisa's probably lying about that, making her other accusation also dubious.
You could say that was meant to mean that Johnny hit her because he was drunk, so because he doesn't actually drink, he couldn't have hit her.
Lisa's mother at one point states she has breast cancer, but it is never remarked later on. Given Lisa's actions - doing things to catch attention and instigate drama for the hell of it, Lisa may have gotten it from her mother. Thus, Lisa sees through her mother's deception and things move on.
Similarly, Claudette clearly doesn't believe for a second that Johnny hit Lisa. Like mother, like daughter.
Denny owes Chris-R money for some drug-related reason, it isn't stated if he was buying or selling them. Earlier in the film, Denny goes to Johnny's apartment to ask to borrow sugar, flour, and butter. Perhaps Denny had purchased marijuana from Chris-R and thought he could make more money by turning them into pot brownies/cookies to sell...?
Everyone always asks the question of "Why is the movie called The Room?". After thinking about this for awhile and taking into account that the script was originally for a play I realized the possibility that every major element of the story was all supposed to take place in one big room. In a play, you would have a stage where in between acts props would be moved in and out, in this way it wouldn't be very hard to convey the idea that all the sex scenes, the betrayal, birthday, etc. all took place in one room. It also explains the horrible screen writing when it comes to actors randomly walking in and out of his house (this obviously didn't translate well to the screen, but adds a lot of Narm to the film.)
An alternative theory is that it is based on the phrase "the elephant in the room" - ie, the affair Lisa is having with Mark behind Johnny's back.
Greg Sestero's book The Disaster Artist contains a piece of meta Fridge Brilliance. Tommy Wiseau wanted English to be the only language spoken in the movie to the point that when Greg said 'catch this' in French during one of the football scenes Tommy was livid and tackled him saying 'No French words dammit!'. The book doesn't go into any more detail but the 'no French words' mandate does help explain why the movie uses future-wife/husband instead of fiancÚ.
The future-wife/husband thing is one of the main reasons why I always thought Tommy most likely lived in France for some part of his life. It's one of the only phrases which strongly stands out since fiancÚ is the more appropriate word in English.
Why did Mark react so violently after smoking weed? Because he took it from Chris-R after "taking him to the police", or more likely, killing him. A lowlife drug dealer would probably be selling drugs of poor quality, mixed with chemicals and so on.
Mark pushes Mike at the trashcans with much more power than it appears. Notice that Mike says "We were just talking on an underwear issue" without specifying whose underwear was it and Mark is visily interested. He might have been afraid that he had left something at Johnny's place and pushes him to shut him up and cut the topic short. It was probably poor acting, montage and no special effects that made the fall look so slow and harmless.
Greg Sestero said in an interview that he had invented a backstory that Mark was a police officer. Hiding violence would be a useful skill for a cop, especially if it was such a morally dubious person as Mark.
It was said Lisa has been with Johnny for seven years. The actress was 18 and didn't look too much older.
She is portrayed as being older than the college aged Denny.
Juliette Danielle mentioned that the original actress for Lisa was older, but quit. She was originally to play Michelle.
Mark's I Have This Friend conversation with Johnny about wondering if girls sleep around takes in a whole new horrific meaning when he talks about a girl cheating then getting the crap beaten out of her. Taken in the context of the nature of the chat, it implies Mark was the one who sent a girl to the hospital. His murderous rage at Lisa at the end of the film does not bode well for her.
Johnny was paying Denny's tuition and rent and while Lisa's in the same boat after Johnny's death we never see any parental figure for Denny to fall back on.
The last we see of Chris R, he's being taken downstairs by Johnny and Mark with a gun to the back of his head. We never hear from him again, there's no mention of taking him to the police, Denny's money problems vanish after the scene and Johnny later has his gun. Clearly, Johnny and Mark took Chris R into the basement and executed him.
Considering Johnny comes back just a few minutes later (not enough time to actually go to the police anyway), this is quite plausible.
Alternatively, Chris-R escaped. It's not like Mark and especially Johnny could hold back a violent drug dealer that looks to be in good shape.
Given how everyone seems to like Johnny, it's entirely possible that he could have defused the situation with Chris-R, paid him off, and let him go.
Mark's repeated statement "It's clear" when asked what happened to Chris-R isn't exactly reassuring, either.
When Chris-R asks Denny where his money is, he responds that it will be there in a few minutes. Who shows up in a few minutes? Johnny. Considering that Johnny is paying Denny's tuition and is said to be loaded, it's entirely possible that Denny wanted to trick Johnny into coming up to the roof so that Chris-R could extort him. Of course, none of the characters address this, and then the sub-plot about Denny's drug problem is abandoned entirely.
If Denny comes over to Johnny's apartment all the time, why has Lisa's mom never met him before the events of the movie?
I was going to say that maybe that was Denny's first scene in an earlier cut of the film, but then I remembered how seldom characters get introductions in this movie.
How did Johnny know Lisa said he hit her? She told her mom and Michelle, but Johnny wasn't there. However, when he overhears Lisa and Claudette talking about her having sex with someone else, he says "How can they say this about me?" when they leave. Which might suggest he was supposed to overhear the accusation that he hit her, and they moved the line to another scene.
That doesn't really work either, however, as immediately after he says, "I show them. I will record everything." Lisa and her mother were also talking under the staircase when she mentioned that Johnny hit her, whereas Johnny seems to be looking at the doorway. So to sum it all up, no matter how this movie is edited it will never make sense.
The tribute game patches this particular plot hole by having Claudette mention it to Johnny one of the times they meet outside his door.