Factual error: When Reynolds is pulling up to the gas station headed to the countryside, you see a blue Michelin sign on the left against the gas station's building. The 'Michelin Man' logo style seen on the sign was not in use until the 2000s. The movie takes place in 1950s. (00:11:50)
Audio problem: When Reynolds is salting the asparagus the camera cuts back to Alma and you can see Reynolds' hand moving in a different direction but the salt shaker sound is still playing. The camera cuts back to Reynolds, and he's holding the salt shaker again. (01:06:15 - 01:06:39)
Other mistake: When poison is first put in the pot of tea, the first shot of breakfast shows Woodcocks sister stirring her tea which presumably is from the same pot, but she showed no sign of poisoning.
