Ok, more stuff I found (was testing a LOT yesterday):
If (and when) you take the Browning HP out of the mystery box, your character will play an approving quote (like "Oh yeah!" or "This'll do!"), despite the fact that the Browning is essentially an M1911 in disguise. If you need reference, when getting the CZ or Python out of the box in BO1, your character would scoff at it, even despite the Python being OP as hell.
Do Panzers run away after they take your gun? A panzer took my shiny PaP'ed MTS, and somehow it ended up on the other side of the map behind a wall of zombies, so I lost it. This, while a great feature, is annoying as hell, especially when your other gun is out of ammo. (e.g this one time where a Panzer ripped a gun right out of my hands and left me with an empty KAP-40. I died.)
Buff the Light Rifle! Despite being, in essence, a fully automatic ray gun, its damage is nothing compared to even the MKII. On round 15, my PaP'ed Light Rifle was becoming a 3-4 hit kill. Disappointing given how freaking awesome it looks. Also, the Light Rifle's PaP'ed texture has no diamond, and that makes me sad.
Some guns are missing PaP names. For example, the MTS and Light Rifle have no PaP names. I can try (probably fail) to come up with some if you need them.
I found a mystery fuse box! At the top of the yellow platform in the first room/warehouse/area (after the first two debris), there is a fuse box on the back wall. I'll try to get a picture out sometime. I have no idea what it's for, as the closest two perks, AmmoMatic and Double Tap, both have fuse boxes. Too busy surviving to figure out what it's for, sorry.
Make Candy Cane Arena less difficult in solo. Seriously, they come from everywhere, and it gets kinda hectic. Also, I found a glitch. If you shoot zombies before they cross the bridges into the map, they turn invisible (except for their hats), and take no damage. Upon entering the map, they reappear with full health. It makes the challenge more difficult, as you have to wait for them to enter the arena to shoot them.
Other little things (not bugs, but interesting)
There is so much junk around that you can run through! I thought that the map was really crowded at first, until I found out that you can run through boxes, bins, and all kinds of stuff. Be careful with this, you don't want to trick players into thinking that they're stuck against the wall when they can dash through the solid-looking green plastic container to their left.
The boxes full of ornaments: you can knife the ornaments to make them fall out of the box. Pretty cool, but if explosions can dislodge them, you may be getting lag, seeing how there's ~30 per box.
Interesting choice of the Ghosts FAD model. Honestly, I liked the MW3 model better, especially seeing that the iron sights aren't as crowded.
One final bug:
AmmoMatic can be glitchy at times. Sometimes, the change in my holstered weapon's ammo will have a delay (e.g. I have 50 bullets reserve for holstered weapon, pull it out, changes to 65 a few seconds later).
AmmoMatic Mystery Box reroll is weird. I can't understand how to do it. The message reads something like: Hold Melee and &&1 and &&2 to reroll.
Also, will it work if you've remapped your melee button? (mine is Q, not V.)
That's all for now. Probably not gonna have time to test today, gotta go to a partay. Still been a very fun map, though! My record is round 16, then I quit after making a stupid mistake.