Pronunciation of 和 in Taiwan This is something that I noticed in Taiwanese Mandarin TV series and films. It seems that they pronounce this character as hàn instead of the commonly accepted hé. 

For example, 我和你 is pronounced wǒ hàn nǐ.

Normally you'd expect accent differences, but this seems to be way off. 

Where did this pronunciation come from? Could it have been influenced by Taiwanese Hakka?
As recorded in Baidu, this unique pronunciation of “和” as "hàn" actually originates from the Old Beijing dialect. Extracted from the blog article titled 台湾人为嘛把“和”读作hàn?, it says the following:


  1945年10月台湾光复，日语的“国语”黯然退出，台胞急着要回复祖国的语文，要说国语，要认汉字。
  1946年4月2日台湾省国语推行委员会正式成立。台湾国语会的标志性贡献是编订《国音标准汇编》，作为推行标准国语的根据。1946年5月1日起，由“老北京”齐铁根先生每日在清晨7时，在电台担任“国语读音示范”，播讲民众国语读本、国语会话，国民学校国语、常识、历史、各种课本，供学国语的人收听，匡正语音。当时的学校教师现听现学现教，使广大的学生也能及时学到国语，学习标准的国音。这位齐铁根当时成了家喻户晓的大师级人物，直到现在上年纪的台湾人还能回忆起齐先生娓娓动听的“京片子”，连词“和”读hàn（“汗”）就此在台湾深入人心。


In short, a Mandarin Promotion Council was formally established in Taiwan after the end of WWII to restore the literacy level of the Chinese Language. Mr Ji, an old-timer from Beijing, was enlisted to do a daily national broadcast to demonstrate the standard pronunciation of Mandarin through a series of dialogue and reading sessions. The teachers learned as they listened and help spread their knowledge to the students. Mr Ji was widely regarded as a Mandarin guru at that time and he is still a familiar household name for many of the older Taiwanese today.