The 2nd creature is the director's father.
While filming the scene of Jon on the street, a passerby thought he was an actual homeless man and gave him a drink and some money(which he returned).
The chase sequence was filmed with the DP leaning off the side of an ATV with the Steadicam strapped to him.
Filming the first dream sequence in Lost took place in late Fall so the water that Patrick Kunnecke laid in was freezing, and he had to get out and dried off in between takes.