is a reference to Kristen Bell in this video. The relevant bit starts at 1:59.
Not sure if it applies but worth a mention!
I don't know if these have been mentioned already, but...
I was looking at the Forum Shop the other day and I found this:
Which may or may not be a reference to this webcomic. I'm not sure if it was an intentional reference or not but you can see why I would think it was.
I also looked at items with references to songs and was surprised that this was not listed:
The description is a reference to these lyrics.
- Added the Cherry lip stain, thanks!
from this month's newsletter is a reference to Garfield
they/them/theirs, please.
references Fantastic Beasts and Where to Find Them, which is part of the Harry Potter universe.

I tried to look but couldn't find anyone mentioning this and it wasn't listed yet, but I'm 99% percent sure is a reference to Gilmore Girls, where the gazebo is strongly featured in basically every other episode c:

Couldn't see this listed yet, but sounds suspiciously like an Avatar: the last airbender tribute, where Sokka's gf does exactly that :')

description is in reference to abba's "money, money, money"
- Time to start a Moana category in Disney
Cursed Ice Shard
A reference to Game of Thrones of course! The wearable part looks like the White Walker eyes and the description is literally a quote out of the show: Season 1: Episode 7: 'You Win or You Die'
Cleared by staff, oversized
[item2=Automaton Plushie] from the March 2010 collection is reference to the Dresden Dolls song Coin Operated Boy
And [item2=Chuckle Me Charlie Plushie] is Tickle Me Elmo toy - Wiki article referencing the craze
- Thanks, added :)
I'm not 100% sure if it's been listed or not. I did check though. Anywho, the is a reference to The Pagemaster. I'm unsure if it's more so a reference to the book or the movie though as I've never actually read the book.

seems to reference the artist Yuumei and her Axent Wear headphones

- almost certain is a Magicians reference. I would have to go back and watch the episode again to be sure, but pretty sure the description is a direct quote from Elliot.