What old films rely on something that these days does not make sense?

[crunchymint]

DP and I were chatting about films that rely on a plot device that does not make sense these days. For example, not being able to phone someone before mobile phones existed.
So 127 hours where the hiker has to hack off his own arm. These days he would have a mobile phone and phone for help.
Any other examples?

The 90s Parent Trap also wouldn’t work now because Concorde would not get you here in half the time