At 15:57 the mechanic places his hand on the money Nacho left. The nails on his hand extend beyond the nail bed but there is no dirt under the nails, which is impossible for someone working on engines whom only earlier used a rag to wipe his hands.
At minute 27 second 40 , Howard Hamlin goes to the valet park ,while giving the key Beethoven is playing in his stereo, the song changes 2 more times till valet parking guy parks the car, both classical songs.in total there are 3 classical songs playing on his stereo within a 1-minute span. Unless the valet parking guy is the one changing the song (which does not make sense) there is no way 3 songs can play within that short span.
In the fridge of the McGill/Wexler residence, there are a couple bottles of Teavana Peach and Mango tea. However, Teavana didn't make these bottles until 2017.
When Mike is about to beat Nacho, he pulls a bottle of whiskey out for the both of them to drink. That whiskey was Town Branch Bourbon which was not available during the time frame of the show.
At 37:44 in the top left corner, a crew member appears from behind a bush wandering into view.