I see things like that alot in spoken japanese. Just like in english, the spoken language often affects the written one.
If you read lots of text intended to represent spoken language, youll find even more such things. さよなら is a common short form for さようなら, 言う becomes つう. I also run into uses of た in spoken form, such as in 何つったて, that seems to add a subtext of "たとえ" to the phrase.
i highly recommend taking these in stride, and just plowing through as mush as you can stomach