Camera angles:
Firstly, there is a close up shot of the woman picking up the money and place it in her pocket. This can imply that she has just taken the money for herself in preparation for the night ahead. This could be money that she will spend on protection or possibly money to do the opposite which could be to partake in the purge. This leaves the audience wondering what will happen to Eva further on into the narrative.


An over the shoulder shot is used when Eva looks into the kitchen worriedly at the women in the kitchen on the phone who seems to be the manager and tells them when they are allowed to go home. This shot is taken in order to emphasis the nerves and distress of the characters and their anticipation to get home as soon as possible.
Editing:
Firstly, the institution title sequence for 'Blumhouse Productions' appears which is a very successful institution that the audience are likely to recognise and assume that the film will be worth watching. There are also credits included which establish what type of horror sub-genre the film is going to be. The credits are in a font which is seen as being associated with the government. Factual information is presented which gives the audience a sense of realism and possibly make them a passive audience. The dark blue background connotes mystery and darkness which makes the audience aware that the horror will be suspenseful and dark.
At the beginning, there is an establishing shot of inside a cafe with one male customer sitting down at a table. This sets the scene and gives the audience a sense of realism and normality. There is then shot-reverse-shot editing between the man and the waitress in the cafe as the man pays for his meal. This focuses of both of the characters emotionless expressions which make it difficult for the audience to know what they are feeling and thinking.
Sound:
The non-digetic music during the title sequence very gradually builds up, but when 'The Purge' title appears, the music suddenly becomes louder.
The dialogue between the customer and the women accounts for the feeling of the unknown due to the man saying "Stay safe". This can make the audience wonder where he is just a protective, caring man or whether is actually going to partake in the legal crimes. Therefore, he knows what is likely to occur later on. The accents are American which notifies the audience on where in the world it it set.
The news reporter creates suspense due to the informative information he is stating. The tone of his voice is wise but also concern amongst the city. This informs the audience on what the purge is and what people must be aware of to stay safe.
Suspense and tension is created when the three workers and discussing the situation and the male worker says " I might kidnap Eva this year" as a joke. However, the tone he say it in is mysterious which makes the audience question whether he is actually joking or not. He also is not showing any signs of nerves or worries as he says "Calm down we've got plenty of time". Whereas the two females are desperate to leave. As he is so calm, this can leave the audience paranoid as to why he is so calm.
Mise-en-scene:

In the background through the window, a large American flag is blowing around in the wind outside. This flag, confirms where the film is set and the respect the citizens have for their own country. This is a way the Americans in the film support the idea of the purge being beneficial for the country.
The money that the waitress takes and discretely places in her pocket can suggest that she is financially unstable and is desperately in need of more money.