THE H1NI vaccine is not something "extra," it is an influenza virus, and one of the many types that are listed as particularly dangerous, and thus end up on the list of viruses evaluated for inclusion for the coming winter.
There are many strains of virus, and they mutate and change a bit every time they reproduce, so susceptible people do well to get the updated vaccine, which includes ONLY the 3 virus strains expected to cause the most serious illness in the coming year. Then those viruses are incubated long in advance so they'll be ready to deliver for the next flu season.
The H1N1 wasn't previously included in the previous vaccine not because it was something "new" and untested, but because it was such a new and infectious strain of an old virus that it suddenly began infecting people as well as animals. This happened AFTER the 3-strain vaccine for the year had been started. So a separate, supplemental vaccine was quickly incubated and made available to the most at-risk patients and medical personnel.
It's pretty normal for the injection site to get red, hot, sore and even swollen for a few days after the shot. This is generally a good sign that the body is mounting a quick attack on what it believes to be an invading infection.
People are highly individual, so there will always be unusual reactions in a very small percentage of patients to any and every treatment. So it is possible the bruise-like marks are related, but it seems far more likely that they're just bruises. I've had plenty of mysterious bruises that may not be sore at all, and so has just about every kid I've ever spent any length of time with.
But we can't see what you are seeing, and I'm really curious about what you find out. I hope you'll tell us "So What Happened." I'm always hoping to learn from real life.