Emptying out the inventory of non-essential items will work (keep a weapon, equipped armour and maybe some potions), though just checking for extra stuff should be sufficient if that is the problem.
For the rope, get him to check how many there are. A couple people already had rope in their inventory when they picked up the 4 pieces there, which stacked together so was difficult to spot. The 4 rope should be in 3 groups (2 stacked together, 2 alone).
Easter egg screenshot:
check-up for Teleport