Originally Posted by captain swoop

Those flaws are still there. As for 'early' radar. On the RN ships I served on the Type 965 Air Warning set was first in service in 1955. It was still in use in the 1980s. It was a development of the Type 960 which was designed before the end of the war and came int oservice in 1946. It included MTI (Moving Target Indication) by phase locking the transmission and reception. This removes clutter, in particular from jamming, and shows only contacts with Doppler.
In the Falklands it was unable to detect anything coming in over the land and a lot of ships were 'retro' fitted with type 1022 from the later Type 42 Destroyers.

This is where things start to get modern. It's a pulse doppler set like the current 967. They don't have human readable output, contact information is extracted by computer system. This is where errors can creep in. On a 'raw' PPI display an experienced operator can interpret what he is seeing and discount spurious contacts. Computer systems can't always do it.