1964 extra bud/stem. Will look similar to this but the extra bud can be larger and in a slightly different locations. You may also find the extra buds on other years as well. I believe the I have found them up to 1972.

1965 Pointed 5. Almost all 1965 cents have a slight angle to the 5. You want to look for ones with greater then 35%...closer to 45% taper.

I have also found a 1968 extra twig/stem:

1985 Pointed 5:

1962 Harp and Guitar:
Harp

Guitar

Various years from the 50's & 60's have Hanging, double hanging and triple hanging numbers:
Hanging number

Double Hanging Number

Triple hanging number would have a third hanger. Sorry...I do not know of a pic of one as a reference.
1953, 1954 and 1955 all have No Shoulder Fold (NSF) and Shoulder Fold (SF) variations to look for. Check out the link for a good guide to the different coins and their values/rarities.
http://www.coinsandcanada.com/coins...nt-1953-1964Look at the "I" in "DEI" on the Obverse of the coin and compare the flare of the tips of the "I" to this diagram to help determine.
1948 has "A" to denticle, "A" Between Denticle and "A" to Small Denticle. For the Small denticle you will have to compare the Obverse denticles to other 1948 coins and you will notice a difference in the size when you find them.
A to Denticle

A Between Denticle

The above pics can also be used for the 1949 "A" to Denticle and "A" between Denticle coins.
That should get you started with some of the more popular cents to look for. Good luck and have fun.