I noticed at the top of the page under the 'Episodes' tab where it says 'Season 1', 'Season 2' and 'Season 3' that there's no arrow beside the latter which creates a drop down menu containing the episode titles. How do I go about fixing it?
I'm honestly not sure about that. I wasn't the one who added the Episodes tab to this wiki.
I would suggest you either a) ask the other admins about this (one of them is most likely the one who added the Episodes tab) or b) screenshot the top of the page and show it to a wiki staff member (they should know how to fix it or how you can find out).
Just wanted to let you know that I worked out how to do the drop down menu (I had contacted another admin but didn't get a response). I looked at it myself and just clicked on the "Edit Wiki Navigation" option from the "ContrIbute" menu and was able to add the Season 3 episodes to the tab.
I also added the Season 4 and Season 5 tabs and will update them with the episode titles whenever they're released. :-)