The fit of the reconstructed continents is the classic example from the early days. Nowadays, we can actually measure the rates at which plates move PER YEAR using satellite altimeters and other sensitive devices.

At the time he proposed it, there were distributions of fossil organisms that were continuous across connected continents, the continents all fit together like a jigsaw, and so on. Now, with magnetic imaging of the ocean floor, there is so much more, but that evidence wasn't available when Wegener proposed his theory.