camera rotating around...
In one of the peak moments of the film camera rotates aroud two characters, "painting a picture of an unsteady state of mind". The same effect can, regretfully, be seen today in much too many films and television serials, almost always to no purpose whatever anymore, except it's a "cool" effect. Was De Palma one of the first to use it in 1976?
(There are also other tricky camera moves and effects in the film, many of them probably credit to the great cinematographer Vilmos Zsigmond)
Gentlemen, you can't FIGHT here, this is a War Room!