When Joe and Simon are walking across the ridge to the summit, there are already footprints in the snow ahead of them.
After Joe climbs out of the crevasse, the next shot of the glacier shows two figures climbing up.
Commenting his descent deeper into the break, Joe says, "I didn't put a knot into the end of the rope. If there was nothing down there, I would fall, and it would be quick." Two minutes before (approx. at 54:30) he is throwing the end of the rope into that break, and as it falls, we see clearly that the knot is properly tied at the end. Just as safety rules prescribe.
Joe wears a model of Cebe glacier glasses that didn't enter production until 2001.
After Joe pulls the rope completely down while in the crevasse, the cut rope end is frayed. Later when looking at the rope end again, it's a nice clean cut.
When Joe reaches the bottom of the crevasse (00:59:57) and starts crawling on his stomach towards the sunlight, you can clearly see the blue helmet of another person.