Continuity mistake: When Telly is walking on the bridge and stops to look at the rooftop playground there are two different bridges. The aerial shots show a much wider, more open walkway than the shots from the bridge. Note how wide the concrete squares are in relation to her body. In the aerial shot the middle seam between the squares is just a crack, but from the bridge you see that the seam behind her is smoothed over by cement or similar. (00:34:40 - 00:34:50)
Continuity mistake: When Ash breaks the window in the house at Long Island all the glass disappears in the window, apart from a little at the top. However, in the next shot when Telly and Ash walk through the window, all the glass has vanished.
Continuity mistake: When the alien screams in the warehouse and the glass breaks, immediately after it shows a closeup of his face and the glass is still intact.
Continuity mistake: When Telly runs out of the house after being told by her doctor and husband that she never had a son, she is wearing a long black cardigan. This is shown in scenes of her running down an alley, as well. Shots after that, for the balance of the movie, show her in a short dark jacket.
Continuity mistake: The top of the cabin is blown off when Agent Al gets "taken up". However, in the overhead shot that immediately follows, we can distinctively see all the figures on the floor of the cabin, including the agent (who is still tied to the chair).
Continuity mistake: When Telly rips off the wallpaper, the rangers jersey disappears.
Answer: Okay first of all, Telly didn't pass any test. The whole thing was an experiment in testing the strength of the parent/child bond. Second, no she did not travel back in time, she simply traveled back to her neighborhood, where everything was as it would have been, had the children never been abducted. Lastly, no the government agents were not aliens, and they weren't exactly helping the beings either, but rather they were minimalizing the damage, as to not have a full on "Independence Day" invasion. Oh also, neither Alfre Woodard (the cop), Dominic West, or the governemnt agent, were killed, they were simply abducted.