I suppose you could say this is a fake film for fake times.
It looked surreal because it was surreal.
Yes, it looked spectacular and lavish, but it was just not real.
Just about everything was created on a computer, no trip to Egypt required.
The day will come when CGI is so good there will be no need for actors and actresses. It will all be created by software.
Rather than follow an established story with the same characters the need to force feed the viewer with PC wokery had to be catered for first.
So we had, characters left out, characters introduced, names changed, genders changed, nationalities changed, ethnicity changed, same sex relationship introduced ... what a mess.
Ironically, the outing of same sex relationship by Poirot in the reveal was callous and cruel. It played no part in the plot at all, in fact the portrayal of Poirot was way off the mark.
Sophie Okonedo was the best thing in it, she was superb and disappointing that she was wasted in this poor adaptation.
Both the TV drama (2004) and the 1978 film were better than this attempt, both being shot on location with actual REAL locations.
Watch the 1978 film, it is much better and follows the original plot far more closely.