At around Minute 20 Konstantin receives phone calls one a couple of mobile devices which he always declines. On each shown phone there is a made up answering screen which doesn't have an answering button, only a button to decline/hang up a call among a few other options you'd typically have after you picked up a call.
The gymnast's uneven bars in the scene at the beginning are not right for 1974. They should be closer together, so the gymnast can wrap her hips around the lower bar.