Factual error: Sir Francis Walsingham was only a year older than Elizabeth.
Factual error: 6 years in a mask and he's able to keep that lovely babyface with just a little bit of grime, which easily comes off? Of course it would have wrecked the whole story but still...
Factual error: When the command module, with the engine shut down, is in earth or lunar orbit or in trans lunar coast (external shot), you hear a rumbling sound. It's in a non powered coast, so there shouldn't be any engine noise.