If you know Some Manager (your friend or relative) you don't need to be worried about anything and this is the best company for you or get ready for hard conversation with your manager regarding what you just finished and customer complained about it few days ago when his favorite employee was there for service. At most he'll say to your face, this is your responsibility now since you was there just now.
Guy racially abused his team mates on customer site while working and get away with it, with promotion to Team Lead (Coz he's nephew to some big manager) and few guys (out of those got racially abused) laid off couple of weeks after since they reported to their manager and that manager told them not to reach HR and they trusted him.
Guy joined the company and as soon as he finished his probation period got promoted to Manager (well again he's close friend of the Senior Manager who's hiring for Manager position)
No career advancements for you, since only person getting promotion (if someone leaves or retires) is 1% coz you know there's always someone who knows some manager and he's going to get promotion and good package, no matter his qualifications or skills.
Well if you want to work in this kind of environment, go ahead, and I wish you best of luck.