When Hugo dies, sitting on Evelyn's couch, his head is leaning to his right side. The next time he is seen, his head is straight up.
Anytime Charlie is in his bedroom and the phone rings, his answering machine should turn on by the second ring.
However, when Teddy calls Charlie's house and Charlie ignores the call, the phone keeps ringing and ringing without the answering machine ever turning on.
The scenes in Las Vegas are introduced with an aerial view of the Strip, with the marquee of the Sands Hotel in the lower left advertising a show called "Glitz" and stars such as Allen and Rossi and the Copa girls at prices ranging from $21.95 to $24.95. Assuming the story takes place in the "present day" (the show first aired 14 May 2007), this view of Vegas would be outdated by more than a decade. The Sands was demolished in 1996.