How do I delete an item from a playlist?

I don’t see a way to do this.

I think you must swipe them to the left or right.
Just like you remove items from the notification area.

I noticed that when scrolling through my playlist the listed items are “wiggley”, so I think that’s the way to do it.

That is correct. They are almost a little TOO “wriggly” in my opinion. I have accidentally removed an item from a playlist on my phone more than once just by trying to scroll up or down. It happens so fast and then scrolling occurs as well so I have no idea what got removed. I kinda wish there was a 5 to 10 second pop-up prompt at the bottom to give you the opportunity to undo various actions that are destructive similar to Gmail when you delete or archive a message, etc.

Agreed, too wiggly.
Or when swiping it away, on the same spot comes a different item that says “undo remove” or “restore remove” or something. That’s what is in the Android (G)Mail app if I am correct. But something you describe would also work.

I kinda wish there was a 5 to 10 second pop-up prompt at the bottom to give you the opportunity to undo various actions

That’s the way it works, unless the audio miniplayer is visible on the bottom of the screen. In that case, as I’ve just discovered, we have a bug that prevents the toast with the “undo” action from being visible. So definitely a relatively recent regression, which we’ll try to get fixed ASAP.

Thanks!