In IE and FF in the date field if you type some nonsense like 'a' it says "a is not a valid date - it must be in the format m/d/Y". If you clear the field the validation error stays the same saying a is not valid. If you then type s the message does not change - still stays a is not valid.
In IE the title in the date picker widget is cut off. All that is visible is 80% of the first Letter of the month.
In FF if you hover over the data picker title the tip "Choose a month (Control+Up/Down to move years)" is indexed lower than the date picker.