So my snake slipped between two big blocks, it's done it once before. Is this a trick or just a glitch in the game?

Do you mean it went right through and didnt hit any? If so that's really weird and I've never seen that before. But if youre talking about hitting two blocks at once, thats very common and even tactic to use when you have a star block. Also, we have discord, https://discord.gg/4ENYQkz