What are the most common mistakes when pronouncing Pinyin? For example, 'shuo' is sometimes mistakenly pronounced 'shou'. 'Juan' is often pronounced 'zhuan'. 

Can anyone think of any others? I want to highlight some common mistakes to teach pinyin pronunciation.
For people from south China, the following may be confused:

z / zh
c / ch
s / sh
n / l
l / r

Many Pinyin input methods include &quot;fuzzy pronunciations&quot;, a feature that automatically matches these confusable pronunciations. For example, if you input zui, the results will also include all characters of zhui.
The Google Pinyin input method uses the following list:

z / zh
c / ch
s / sh
an / ang
en / eng
in / ing
l / n
f / h
r / l
k / g
ian / iang
uan / uang