That is the most weak-ass flame I have ever seen.
I guess they didn't have a water deluge system at this point, which would've made it look less weak-ass.
To be fair, the Redstone really wasn't that burly of a rocket anyway (it was only an SRBM, not an ICBM like the Atlas or Titan II that were used later). As I recall, it was based on the V2 and used pretty much the same propellants and steering vanes in the exhaust stream.
Okay, yeah, it's not often I watch rockets that aren't orbital-class.
(Sorry Blue Origin, I don't care about you)