Within the beginning of the episode modern crime genre conventions are presented as the main character Sam and officers raid a suspected murders house instantly creating a mystery as they are nowhere to be seen until a chase scene and questioning of the suspect professionally until Sam is in the past as they question another suspect which turns into more of an interrogation as DCI Gene and the other police in the past are presented as politically incorrect also Sam already having an idea about the suspect from the evidence from the present subverting modern crime conventions but still sticking to other conventions like the mystery and solving it by the end of the episode which links to Steve Neale's Genre Theory as the genre changes through time and having sci-fi conventions like the idea of him being in a coma.
The main opposite present within the episode is the differences of the main character Sam and Gene as they battle throughout the episode on what to do about the mystery as Sam works like he did in the present which is drastically different from how Gene and the other officers work for example how Gene goes against the law for justice. Another major opposite being reality vs fantasy as its constantly questioned whether the past is actually real or just a figment of Sam's imagination these link to Levi-Strauss's theory as these opposites help continue the narrative as the confrontations between Sam and Gene usually end with more information in the case.
An enigma is instantly created as we have a suspect in the murder case which is carried out throughout the episode but also more enigmas are created like Sam's condition after being hit by a car as some form of hallucinations throughout the episode connoting to him being in a coma however having reasonable explanations to just being hallucinations and Sam actually traveling back in time. These link to Barthes theory as Enigma codes are created throughout the series
The narrative is restricted as we only know the same as Sam we as the audience have no further information on the narrative.