Typical Pronunciation Problems by Language Group

Common Pronunciation Errors

By Chinese Speakers: Chinese Pronunciation Errors

By Russian Speakers: Russian Pronunciation Errors

By Chinese, Thai, Arabic, Korean, and Spanish Speakers: 5 languages

This is taken from an English Learning PDF: www.englishelearning.com/teach/teach05.pdf 
This PDF shows typical pronunciation problems experienced by different language groups (click the link to go to the PDF)

A majority of students experience the following problems:
that
thank
run
back
dad
gag
pack
tank
cap
hang 
zoo - sat
love – run
vest - win
chum - shin
yam - jump
dad - tank
s endings 
ed endings