Trivia: K Callan, who plays Christopher Plummer's mother in this film, is actually six years younger than Plummer in real life.
Trivia: At the end, Benoit Blanc says he noticed the blood on Marta's shoe the first time she stepped in front of him. Rewatching the sequence when they first meet, as he says "I've been doin' a little pokin'" he does indeed look down as he speaks and takes a fraction of a second pause, noticing the blood but continuing to talk as normal. (00:23:45)
Trivia: Michael Shannon has played Jaeden Martell's father twice on screen, in this movie and Midnight Special.
Trivia: Jacob Thrombey, the far-right troll, was based in part on the backlash and targeting that Rian Johnson experienced after The Last Jedi was received unfavourably by some people. He's stated it's a broader commentary on the state of social media, not about his Star Wars experience specifically. "It doesn't matter if you made a Star Wars movie or if you have a cooking YouTube channel, or you collect books on the internet, someone's gonna be yelling at you on the internet."
Trivia: Joseph Gordon-Levitt cameos, at least his voice - he's heard on the TV show Marta's sister is watching. He's a frequent collaborator with director Rian Johnson.
Chosen answer: She is holding cake all 3 times, actually, so the only difference is that the first time she speaks. It can be a case of unreliable narrator, but I'd write it down as a mistake (deliberate, probably, as the phrase is important for the plot and they didn't want to hammer it in), since as you said, the other times even when they tell things to the police in a different way from what happened, the details tend to stay consistent, except for parts that are obviously made up, such as who is putting down the birthday cake for Harlan Thrombey therefore appearing subservient and not as close (when Richard tells the story, it's Walt and his wife, when Walt tells the story it is Richard and his wife).
Sammo ★