Edit: On the 720p version I have ripped there is a big ass bird at 1:47:25. (Also the truck scene starts at 1:46:22 for me).
Edit 2: Ooh I found your UFO at 1:47:30! It's a street lamp! Your frame is taken a fraction of a second after this one and with the resolution you were watching it, it would have been hard to see the pole.
Still I think in retrospect the amount of time that films been out someone must have seen it too, but a quick google on it last nite revealed no-one else was caught out! Evidently as it was a lamp!
Ive oddly developed this thing of looking at sky shots in movies/photos, a completely pointless venture really...dont know if you'll remember the story/clips of the John Wayne film UFO? That pretty much got me started, And the various newscasts which allegedly show stuff in the background scenes...
So glad you cleared this one up!