A winch is shown being used incorrectly. When the agents are winching the cable back from the sewer, the shot of the winch that is shown would be letting out more cable, not bringing it in.
At the end, Monica Rambeau is illuminated by what is supposed to be a searchlight from a helicopter, but it is obvious from the way the light beam moves that the source of the light is fairly close, and it is stationary, not moving as a helicopter would. If the helicopter were actually hovering that close, there would be some serious wind on the grass and on people's hair.
WandaVision (2021) is set three weeks after Avengers: Endgame (2019), placing it in either late October or early November 2023. When S.W.O.R.D. find out the real identities of the Westview residents, their driving licenses with their birth dates are shown along with S.W.O.R.D. files containing their names and ages. None of the ages match with the birth dates to suggest a 2023 setting, or even a 2018 setting for those who may have been Blipped.
Darcy inappropriately uses the term "theory" twice. As a Ph.D. scientist she'd be well aware that she meant to say "hypothesis". In science, there's a clear distinction and it's a very big deal.