I am not a skeptic or a believer, but as a video producer, I can tell you that the edits you see in these videos are either NOT for the sake of faking the films, or are done by someone who is a professional, and leaves no trace of the editing behind.
In the first video, the little glowing dots you can see in the closet ARE visible, quite clearly, in fact. If you pay attention, you see two things - First, a very fast-moving "orb" as it's called, shooting from right to left, about halfway down the wall underneath what looks like a light switch. (I didn't even notice this at first - SapphireRose saw it and pointed it out to me.) It's quick, and I don't think the guy who took this video noticed it at first. Secondly, you see a shadowy figure move quickly into the dark closet - it seems to appear from thin air and gets a little more defined as it slinks into the shadow.
Redmage - you say that it's a different section of footage, but I strongly disagree. The person who recorded and edited this footage simply slowed down a specific section of the footage where he saw the figure moving into the closet - during that area of the video the first time, there were no dogs barking in the background for that period of time. The lighting is also different, but as FireSprite explained, that's because the Gamma of the footage was increased so that it would be easier to see the shadow moving. Finally, you saw that the camera zooms in "manually" and that the background noise is different. During the "haunted" section of the video, you notice that the camera does NOT zoom in at all. When the editor enhanced this section of footage, it seems like he used the video editor to slowly zoom in on the frame simply for dramatic effect. Also, he slowed down the speed of the video, which you explain the slightly distorted background noise.
Personally, I do not believe the first video was faked.
The second video has some creepy shit in it, but there's also some suspicious stuff on the part of the guy filming it.
There's pretty clearly no one upstairs in the attic, He pans around the entire room and there really isn't anywhere for anyone to hide (despite the MESS!). The aluminum can that later moves "on it's own" doesn't appear to have any strings attached to it, but he only looks at it with the camera for a brief moment.
Notice that not only do both dogs seem creeped out, the white one moreso, but even the cat seems to think something is amiss - it looks up at the ceiling for a few seconds before walking away.
SapphireRose pointed out that the guy seemed to intentionally look at the aluminum can before it moved, as if he thought something were about to happen specifically to it. Could be because he knew what was going to happen, could just be a coincidence.
The scary part about this has nothing to do with the can that moves - it's what happens after that. Based on the background noise, the guy cleary got the fuck out of Dodge, and you can hear that he is no where near the camera (IMO). Pay attention to the sounds in the background - the lights didn't just go "off" - something physically pulled the chain that controls the light, as you can hear it dangling and making noise as it touches the lightbulb.
While the lights are off, something else really friggin creepy happens - an acoustic guitar, that was resting close to the floor in a horizontal laying down position, lifts off of the floor and seems to be "tossed" onto the box where the can used to sit. It had to move up about three feet and one foot to the right to land where it did. HOWEVER - this part of the video seems faked. If you look closely, right before the guitar moves, the lighting changes just BARELY. Just to the right of the brick chimney stack, something suddenly becomes visible that wasn't before, like a bad stop-motion edit. It's a pretty clear cut in the film, and I suspect the footage was edited so someone (probably the guy) could go behind the chimney stack and toss the guitar. Who knows, it could just be that something gets moved as the poltergeist tossed the gitar, but it looks like a pretty obvious film edit.
*EDIT* Something else I just noticed - while the lights are off, just before the guitar is moved, you can tell that the footage has been edited because there is a box on the floor in the bottom left corner of the screen. It seems to "fade" slightly to the left - it was moved and the guy edited the footage to try to cover it up.
The third video is creepy, because I see no film cuts, the dogs are obviously both looking at SOMETHING, and I see no evidence of the jerky stop motion that RedMage claims to see - the film is continuous and the door doesn't "magically" change positions without being moved in a fluid motion.
That's just my take on these. I've been very interested in the paranormal for many years and have captured a few EVPs myself, so this kind of stuff really piques my interest.