There are some slightly local differences in word choice. For example in St. Peterburg they say "поребрик" instead of "бордюр", "парадное" instead of "подъезд" and "шавЕрма" instead of "шаурмА". Also I used to know a girl who lives in Saratov and only difference between her speech and mine was that she used the word "базар" instead of "рынок".