As the first episodes of season 4 addressed the attraction between O'Neill and Carter, its after-effects were chosen to be still noticeable in "Window of Opportunity". The progressing frustration of Teal'c, "the man of infinite patience", is shown by his Kel'no'reem'ing (a fictional meditational state) during the briefing. The episode's main guest star was Robin Mossley as Malikai; Mossley would play a different character in the season 10 episode "Morpheus". Several crew members make cameo appearances in "Window of Opportunity". Nicole Forrest, the show's head of accounting and director Peter Woeste's wife, appears as Malikai's wife on a photographic device. One of Anderson's stand-ins on "SG-1", Bill Nikolai, plays the technician in O'Neill's bicycle scene. Director Peter DeLuise briefly appears as an airman who helps Daniel recover from being repeatedly knocked down by Sgt. Siler in each loop. Siler himself is played by stunt coordinator Dan Shea. The name of writer Joseph Mallozzi appears as the author of the book that O'Neill and Teal'c use to study the Ancient language.