If you are new to campers, bring your smartphone to the dealer walk through and video record as they demonstrate how all the equipment works. You'll likely refer to it at some point until it becomes familiar.
Try to save yourself from buying all sorts of stuff for it right away, camp with it and learn what you might need through experience.. Pouring through these forums you can easily add another few thousand dollars in nice to have mods.... It you'll feel better making the mods that you want and would use from a practical point of view.
The cracked window, pay attention to how the dealer repairs this - since they will be installing the replacement instead of the factory, you want to be sure to understand what exactly they did and now they did it. It's not unheard of for the roof windows to leak, it's easy for this to happen if attention to detail is not paid,
Many have used a 3M sealing tape (search the forums) as a more durable and reliable precaution against roof window leaking as an added measure... It's possible to DIY but you may want to inquire of the dealer if they would do that for you while the original caulking is brand new and doesn't need replacement.... It's more work later because you usually want to strip and redo the caulking too.
Make sure you understand how the heat pump/air conditioner works... For the heat pump there are limits, it can't be used in freezing temps (really below 55* I think) and the propane furnace should be used instead.
Understand how the water pump and hot water heater works and where the bypass is. If you might need to winterized seasonally, you might want to have a water pump bypass installed now so winterizing is a quick and easy process.
Make sure to know how to get the propane going to all the appliances, how to debug a furnace that doesn't light, etc.
Last, don't run the AC with a 110v AC adapter, it's designed for 30 amp service and using something less like a household outlet will severely stress the home wiring and your adapter or extension cord and presents and electrical risk.