codes and conventions

Codes in a film are a significant factor that create a strong representation and meaning to the audience. there are different sub categories of these codes which encourage the audience to realize connotations and denotations which conform and subvert to stereotypes.

Audio Codes -sounds which the audience hear in the film: 
dialogue
 music 
special/sound effects.

Written Codes - any written words/phrases/passages which are present in the film:
 headings
subheadings
logos
labels
font 
 size
 placement of the writing and signs.

Technical Codes - this regards the usage and techniques of equipment that is used to tell the story, this heavily links to the technical elements of the film: 

camera angles

camera movement

lighting

camera shots

framing onscreen

perspective 

layout

Symbolic Codes - anything which has a symbolic meaning and shows what is 'beneath the surface' of what is obious and pictured on the screen:
juxtaposition of characters/objects,
 lighting,
use of color,
 feelings/emotion,
equality and stereotypes.

Conventions of a film are the general typical and expected methods and ways of producing a film (differentiating with each genre of film).