really really random and may not apply to everyone hotelling but...
bring door stoppers o A o
2 years ago my group disturbed a few people on our floor because we were traveling between 3 rooms for help and such xD
and last year we had two conjoined rooms but we often ran the risk of opening the door into someone who's using the common area sink (or in one case, a kettle with hot water. ouch)
also another random thing would be pillows and towels. every hotel we stay at always seems to run out of these things...