Corrected entry: When Richard discovers the old registration book in the hotel attic, he appears to find his signature on the left hand page. When, in 1912, he actually signs the register, he signs on the right hand page. Strangely, the pen and inkwell are located to the left of the register, which would be inconvenient for all but left-handed customers.
Corrected entry: If Richard never reveals to Elise he is from the future, how then does the old Elise know where and when to find Richard to give the watch to and create a time loop?
Correction: I agree this is not explicitly explained in the film. But because Elise was an actress, it's not a stretch to imagine that she would still follow the theater news, see the announcement of Richard's new hit play in 1972, recognize him, and go to the premier party to give him the watch.
Corrected entry: When Richard is searching the library for information about Elise, he turns several pages of a journal. He finds the photograph of the old lady, but that page had writing on it in the previous shot. (00:16:55)
Correction: You can hear in the background that he turned another page. After the shot with the writing the camera shows Christopher Reeve and we hear that he turns another page where he finds her picture.
Corrected entry: Richard comes from the elevator holding two color books, 40 seconds later he goes into the Hall of History holding one with both hands, 5 steps later and there's no book at all. (00:10:30 - 00:11:25)
Correction: If you look closer, you will see that he has only one book when he comes out from the lift, and that he is holding his finger at a certain page, like a bookmark (this is your confusion, because it looks like 2 books but in fact there's only one), and after he enters the Hall of History he leaves the book on a table or something. We don't have an image that shows him when he left the Hall of History, the scene cuts from the Hall to outside the hotel. When he's out asking Arthur about 'the woman in the picture', he doesn't have it anymore because he might have been to his room and left it there.
Correction: Richard is carrying just one book, it's white with a red spine. However, the mistake occurs when he walks into the Hall of History. The book he is holding is now brown. And then, five steps later, he is not carrying it at all. Later, the white and red book is on his table when he is eating his lunch.
Corrected entry: Richard Collier whistles Rachmaninoff's "Rhapsody On A Theme Of Paganini" while rowing with Elise McKenna without the negative effects that his memories from his 1980s life have later in the movie. Collier's references to the time when he "knows" he will check into the hotel also fail to affect his equilibrium.
Correction: Richard needs to avoid things that will directly make him think about modern times.He still has all of his memories, so obviously just any thought will not affect his time travel.
Corrected entry: In the scene where Christopher Reeves is looking at the magazines the librarian found for him, he is wearing a blue button-down shirt when she hands them to him. As he is looking, the shot changes to the cover of the magazines with Elise McKenna in it, when the shot changes back to Christopher Reeves he has a blue and white striped button-down shirt on.
Correction: The shirt he is wearing doesn't change. The confusion is due to the camera focus. If you look closely just before the first shot changes, the stripes appear on his shirt as the camera zooms in on him.
Corrected entry: When Richard is trying to go back in time, the picture above him (that was removed earlier) appears above the bed in one quick shot, then is gone again in the next shot.
Correction: Not true. I watched the whole sequence twice. At no point does the picture re-appear. You must be thinking of the picture from the past that appears very hazily as he is trying to go back in time.
Corrected entry: Reeves' character tells McKenna's agent that he is a playwright who has seen his work published - yet this memory doesn't throw him back to his own time; he has to see a penny to be snapped away from Elise.
Correction: Just mentioning that he is a published playwright may not necessarily conjure up memories. Actually seeing and holding something from his own time will certainly propel him back to the future.
Corrected entry: Aged Elise McKenna presents college student with pocket watch in 1974. Student (Reeves) takes pocket watch back to Elise McKenna in 1912, and she keeps it her whole life to give back to him in 1974. Who made the watch - where did it come from?
Correction: The scene is right but you are wrong - this is not a plot hole. In the physics of time it is called the Jinn - the item that has no beginning and no end and exists in a netherworld - with a world line that looks like a hula-hoop. Read about this concept in "Time Travel in Einstein's Universe" by J. Richard Gott.
Corrected entry: When Christopher Reeve is looking backstage for the amazing Elise McKenna, we see a number of plywood stage items. Set in 1912, this action predates the invention of plywood - 1933. There are also extruded aluminium door controllers on many doors.
Correction: Modern plywood was invented in the mid-19th century, and was in common use before 1900. See: http://www.gp.com/build/newsRelease.aspx?NewsID=2372.
Correction: This is not correct. When Richard finds the hotel register in the attic, he turns the page and then as his finger slides down the page, you can see the blue line on the left hand side of the register which was a page outline. This reveals that he did indeed sign the right hand side of the register.