People have been emailing me additional examples:

וייראו העם את ה'

First in ויושע. We say 'וייראו העם את ד

Most people say va-yir-oo. That would mean "They saw HaShem". Correct pronunciation is vayee-ri-oo. (L'choira one would have to correct the baal korei on that one...)

לישיני עפר

In Shemone Esrei we say לישיני עפר. 

Most people say lish-nei. That would mean "for the two dirts". Correct pronunciation is lee-shay-nay.

בעל גבורות

Right after that we say מי כמוך בעל גבורות.

Most people say bal gevuros. That would mean "Hashem is NOT strong"!! Correct pronunciation is baa-al gevuros.

מחיה מתים אתה רב להושיע

From rabbi Elchonan Adler: mechayei meisim Ata.... Rav lehoshia NOT mechayei meisim... Ata rav lehoshia

אשירה לה' כי גמל עלי

The word "גמל" should not be said with a double קמץ (that would mean “because there is a camel on me”) but with a קמץ and a פתח.