George is trying to escape the lava and moves into the future at an alarming rate. He notices there is civilization and stops the time machine quickly causing it to spin out of control. George falls out of the machine and lands on the grass. The nitpick is that just as the scene fades out you can see what looks like ice falling from above him and lands around him. The next scene is George just getting up from the ground and there is smoke all around him. My guess is that they dropped the dry ice a little too soon to give the smoke-on-the-ground effect.