Again, in general, people probably have a much hazier understanding of period-appropriate hairstyles. They might be anachronistic, but they're less likely to register as such unless the style is really severe. Things like fonts occupy a similar space, where the setting might technically be from a time before, say, Helvetica was created, but that won't register for most people. Modern tattoo artistry, on the other hand, is something that obviously never shows up in traditional western historic imagery and can include content that could be totally incongruous with the rest of the costume and environment.