Let's see...in no particular order.
storing datetime in ANY other datatype.
NOLOCK
Poor formatting
Not having a space between parameters in a function call (parm1,parm2,parm3)
Not having a space in a where clause or join condition. (MyColumn=SomeOtherColumn)
GUIDs as clustered indexes
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Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/