Why do old movies have random sparks in the picture

[deadmau154]

Like this:

But they'd show up for a second and then disappear
Why ?

 

[Deleted member 144336]

Like this:

But they'd show up for a second and then disappear
Why ?

 

[lalalanotlistening]

film degrades over time + scratches, dirt, etc

 

[Me-Mania]

Like this:

But they'd show up for a second and then disappear
Why ?

Who knows