Great use of Day for Night shooting but for Shadows everywhere

Just watched The Bravados after about 30 years and thought it still a very good western with great performances but Shadows give the game away that night scenes were really shot during the day.
I noticed even when there was no light anywhere that shadows from humans, horses etc were very noticable.
It didn't ruin my enjoyment of the movie but person on here remarked in reveiw rating section.
And many of the night scenes are filmed with a bold darkness, the color stripped down and everything hard to discern.how great the night scenes were with all the colour drained out.
The reason why the colour was drained out was blue filter was put over the lens hence why it looked so dark blue.
A lot of movies especially in the 50S were shot day for night and probably the most famous or maybe infamous was Plan 9 from outer space.
But as I said shadows are always the dead givaway now footage could be put through a computer to remove them but then they had nothing able to do that.