I can give a few points as to my thinking...
The table was a limpfest the time I was there and it was the best cards I saw in a while so I limped in, confident that no one would raise.

On the flop I checked b/c I wanted to get him to believe that I was trying to hit my flush as cheap as possible.

On the turn I didn't know if I should reraise. I didnt want him to think I had a good set so I smooth called and took time doing it.

On the river I was going to put in about $0.80 but I just didn't know what he had. So thats why I priced him in with $.25. I figured better something than nothing.