Yes, I did find the donated computers issue quite interesting - for the reasons you mention, and also because it actually played on real life fears of parents about what computers might be doing to their children.
One thing that my flatmate was complaining about was the effect where the children's faces were lit up with the pattern that was on their computer screens - like that happens in real life!!!!
I find it hard to believe the entire Earth was transported - but to be honest, this is only because of that car they saw floating past. On the other hand, in the pilot episode there certainly didn't seem like enough debris from an entire planet - however I rationalised this as some kind of digestion process of whatever was enveloping the earth BEFORE the flash.
Too many alternatives...
To throw time travel into the mix is interesting too - but I think an added layer that is somewhat unwelcome. We already have our time travel element, and I think I would be uncomfortable with the idea that the sentients' had both teleported to the other planets AND time traveled into the last five hundred years.
Although.... and perhaps my dim memory of space travel physics is a bit rusty here, but perhaps if the sentients' transporter was able to take them somewhere else instantly, this still might work, depending on what speed the Seeker was actually travelling at - and we know his speed must be an issue, as he arrived at all those other worlds late, and at Earth just in time.
Arrggghhh. This is why I changed my degree to an arts subject
At one point in the ep, Chuck mentions that the linking factor between what they had seen, and what happened in the future was that the satellite they put up was called "Bright Sky". Was the only link the bright light? Surely the Leviathan link is something closer?
I am going to have to pin down some transcripts for this show, as I don't have the earlier ones on tape anymore. I wonder will sky rerun it once the eps finish in a few weeks.
And thanks for the explanation of Follow the Leader, Ranger.