Part of spread beam hits the object and goes to the film forming the object beam, and part of the beam hits a mirror which directs that portion to the film forming the reference beam. These holograms yield greater resolution. But, with this resolution you get less depth of field or Coherence Volume. By splitting the object beam, you can light the object from many different angles achieving lighting effects more akin to conventional photographic lighting techniques. But remember that distance from the first beam splitter through each of the other beam splitters to the film must be equal.
Any hologram has the real image waves emerging from it.
These waves are usually very distorted. Here is a set up that can produce a good real image. The telescope mirror collimates the beam so that instead of a cone of light for the reference beam, you have a tube of light. After setting up to view the virtual image, the film is rotated 180 degrees horizontally to view the real image. You can playback with filtered light source as usual.