Minecraft wiki entry for Strider, associated text: If commands are used to saddle a baby strider, and the player rides the baby strider, the player takes fire damage due to not being high enough to avoid the lava.
At one point in the strider's development, before it was added to the game, a strider out of lava would retract its legs and start to take damage while bouncing around until it died, similar to how fish suffocate when out of water. This feature was discarded for being "too sad".[10]
Part of the reason that striders drop string (from their bristles) was to answer the question of "how do piglins make crossbows?".[10]
The bobbing animation that the strider makes while walking was initially an accident. However, the developers thought it was "quirky and fun", so it was added as a feature.[10]
Striders had a fin in their texture file. The fin wasn't visible in-game and was removed in 20w15a
Strider's fin