Goofs

The dog is put outside shortly before Reed and Bryant go upstairs. Pooch is not let back in. A moment later, when the two characters are upstairs, the dog is waiting at their bedroom window.

According to the intertitle, Reed and his group are expelled from the National Socialist Convention in Chicago. In the next scene, Reed and Bryant are back in Croton-on-Hudson, wearing the same clothes, as if on the same day.

When Gene and Louise talk in Gene's apartment, the position of Gene's cigarette pack changes from shot to shot.

In the kitchen, after Eddie says that he missed the meeting with Levine because he had to take his wife to the clinic, Jack opens a cabinet door to get a pill bottle. Louise hands him the pill bottle. Jack turns to face her and takes a step away from the cabinets. From Louise's POV, the cabinet door is wide open behind Jack. The shot shifts to Jack's POV of Louise, then back to her POV of Jack. The cabinet door is now closed.

The film depicts Bryant first meeting Emma Goldman in Reed's Greenwich Village apartment. In fact, Bryant knew Emma Goldman from Portland, where she (along with her husband, Alexander Berkman) had been hosted by Bryant and her husband, Paul Trullinger.

John Reed is shown dying of progressive kidney failure. In real life he died from typhus.

Reed attends the Congress of the Peoples of the East at Baku in Soviet Russia. The Congress was a Communist conference involving Jews, Chinese, Koreans, and many others. But the movie depicts it as a Muslim rally where the mob shouts "jihad".

The Finnish doctor tells Reed that his blood pressure is too high, but at that time, hypertension was not considered a problem by most doctors, who did not even consider treating it. Not until the mid-'40s did doctors begin to understand the dangers of high blood pressure.

In Booster's dinner in Portland 1915, the announcer says he's ready to make the world safe for democracy. In 1915 the United States was still neutral and the phrase "make the world safe for democracy", was actually part of Woodrow Wilson's war message to Congress which he gave on April 2, 1917, two years after the Portland event.

The pet dog is a Golden Retriever, but the first Golden (Champion Speedwell Pluto) wasn't imported to the US from England until 1930.

When Louise first comes to New York and finds John's apartment (during the time of WWI), some of the apartment windows behind her have air conditioning units.

In the background of Reed's New York apartment, a modern streetlight is visible.

Louise's makeup is out of synch with the continuity of the film. In many of the "earlier" sequences she appears old and drawn, while in the "later" sequences she appears younger and less tired. Apparently this was the result of the film being shot over a period of time, out of sequence.