I'd say focus and white balance (or colour correction) of exteriors are the two biggest jarring factors. The actor in some scenes is behind the focal point for the entire shot, or moves out of it and the focus is not changed - eg. in either of the dinner/bar scenes, or in the jewellery shop where the 'diamond ring' sign is not too legible.
The exteriors are way too cold - there's no colour except blue in any of them. It may have been a stylistic decision, but when the interiors are properly adjusted it feels strange to cut between them (especially going straight from the poker game to the outside at the start). It would have worked if only the opening scene were set like that - to distance it from the rest of the film.
There were a few lines that were confusing - one that sticks out at the beginning: about "paperwork...serial kidnapper/better him than us". This could work better if their order were switched ("there's a serial kidnapper...he's doing paperwork"). It's like a pronoun - you have to be careful about what it's seen to be referring to.
There's too much moving to music. People driving to music, people drinking to music, or walking to music. It feels very filler-ish when it's so condensed: in the first 6 minutes probably 40% is that. There's not enough content, not enough to make somebody interested from the outset.
Considering there are only 4 people we need to remember, there are too many extraneous characters. A whole poker table full of people we never see again.
Also, what was the situation with the kidnappings? We see at the start that the white shirt man is the apparent perpetrator, and then it's actually his boss? Why did the boss kidnap black shirt's girlfriend - how did he know she was reporting him to the police? Why didn't white shirt just report him himself, or get the other woman to do - since he knew the first woman was his brother's girlfriend? What exactly is the deal with white shirt leaving for six months?
I don't really see how anything is resolved at the end, either - white shirt still wants to leave the business, black shirt's girlfriend is kidnapped: it's more of a set-up for a longer story than a resolution to this one.