Not so much 'old school special effects', but more 'behind the scenes / making of', I was fortunate enough to be staying in an inexpensive backpackers in Vancouver in 2017, and right outside they were filming a scene for 'Deadpool 2', so somewhere on my laptop I have a number of photos and videos I took one night from the 3rd or 4th floor.
I tell ya, making movies takes a LONG time. I watched them until about 2am and for all those hours they spent doing that one part of a scene, it's only something like 10 seconds in the movie.
For those who know the movie, it's the scene near the start after his wife is killed and he jumps out the window. From where he's on the road below, nearly hit by a car, and charges into another car, those few seconds are the ones I saw being filmed.