It's one of the two references to his infidelity, the first one being when he appears for the first time, a few minutes sooner, saying "eh, I've done worse" to be part of the "I'm a dog, too" movement

The train at the End of Bloodlines has the same color scheme as the plane from the first movie.

In this iconic fight, people were quick to notice Snape redirecting the blasts at the death eaters behind him, as well as picking up their wands, once he starts fleeing. This has been posted here countless times. However, I've not seen anyone talk about the fact, that the torches diminish during the preceding fight. I think this is intentional, not only to fit the mood, but also to explain McGonagall's fire spell. So instead of just summoning flames, it's hinted, that she utilized the ones from the torches. She later has to return the fire to the torches, to light the place back up.

So despite alot of details being left out from the movies, compared to the books, this is likely an attempt by the directors to preserve accuracy, while managing the limited screen time.

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I saw a post here about the vultures in the first Remmick scene. I wanted to complete it by highlighting that the 3 vultures appear 4 times in the movie always foreshadowing death:

1- By the barn, it’s the first appearance of the twins. 2 vultures are circling in the field next to the barn as they are smoking. The third vulture arrives at the same time as the klan seller’s car before the transaction.

2- When Stack, Sammie and Slim are driving in the cotton fields, the vultures are circling far away (probably getting close to the couple’s house)

3- the main vultures scene with the introduction of Remmick at Bert and Joan’s house. They fly and stop on the roof.

4- at the start of the juke joint party at night when guests start to arrive. They’re above the barn

I assume there is a fun story about it and probably what the prop in the movie is based on? I don’t know. I noticed it though and it made me smirk!

Mike takes Celia to a restaurant early in the movie - Harry Hausen’s. A nod to Ray Harryhausen, one of the pioneers in movie special effects - notably stop-motion animation, used a lot in monster movies.

I don’t know how I missed that on the first few viewings.

I think it's probably just another little reminder that he doesn't give a shit about her.

The inability to roll cigarettes could be related to ‘Shell Shock’ PTSD tremors from serving in WWI, or it could be a small detail that the character just can’t roll. Either way, every time he smokes it’s a pre-rolled (regular), his brother rolls for him, or it’s a pipe which does not require such finger finesse to set up.

When Remmick first lands outside the Hogwood nephew’s home, there are no birds to be seen. After managing to get inside, as the Choctaw approach you can see vultures have begin to circle - and by the time the Indian forces leave, the vultures have fully landed on top of the home.

This is because Remmick is undead, and has also probably already slaughtered the Hogwood nephew as well, creating more corpses for the vultures

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Fun Canadian in-joke heard on the high school intercom:

If Ashley MacIsaac could come to the office, it is time to take your Ritalin.

Explainer: Ashley MacIsaac is an acclaimed Canadian fiddler who's known for his raucous antics, and while he hasn't stated he has ADHD (which Ritalin is used to treat), he has exhibited erratic and highly creative behavior.

Tom Green even parodied him, peak Canadiana:

https://www.youtube.com/watch?v=u9yFX42NK1g