Watch the String Bending online guitar lesson by BJ Baartmans from Slapback, Billy & Twang Guidebook
One thing you don't hear so often in late 50's guitar is the kind of string bending that blues and rock players developed. One reason for that may be the heavier string gauges that where common at the time; usually flatwounds. James Burton and some other players starting using lighter banjo strings to facilitate easier bending. But that was more than likely the exception to the rule.
The fast tempos that a lot of the rock and roll era songs had may have also been a factor. But, most players did use some string bending to create a bit of a blues feel, utilizing half-step bends or even smaller pitch changes.