Audio problem: At the beginning of the movie, a local errand guy delivers a box to Poirot from a gondola. The actor is supposed to be speaking Italian in his first phrase, but he says "Segnor Poirot, lo pesce!" (Mr. Poirot, your fish!), totally off in accent and grammar, obviously from an English-speaking actor poorly faking an Italian accent. Moreover, the box does not contain fish, but turns out a few minutes later to be a box of chocolates. In fact, the Italian version redubs this line entirely and the guy says the equivalent of "Mr. Poirot, your sweets" in a Venetian accent ("Sior Poirot, I suoi dolcetti!").
A Haunting in Venice (2023)
1 audio problem - chronological order
Directed by: Kenneth Branagh
Starring: Kenneth Branagh, Jamie Dornan, Kelly Reilly
Other mistake: Poirot receives a box of chocolates when he's home, then goes out shopping for eggs with the same box in hand, and in the next scene he's back home, having breakfast with the eggs. There's no apparent reason for this behaviour; who goes out for an errand bringing along a sealed box they just received?