Significance

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He made some pretty remarkable predictions, however most scientist believe he got lucky, they attribute these predictions to more likely reasons, than what Velikovsky insisted they were.

1. That Jupiter emits radio noise.

2. The Electromagnetic force of the sun is a major factor on the way comet tails behave.

3. Venus would have a perturbed rotation.

4. The atmosphere of Venus would have an unusually high temperature.

5. The moon rocks would have magnetic remenace, that there would be traces of hydrocarbons or carbides, and also that some amounts of radioactivity would be found.

in regards to
#1  his critics point out that he had no idea of what frequency they would be. Also he attributed it to being turbulence in it's atmosphere from "the expulsion of Venus" when it is due to a strong magnetic field and ions trapped within.

#2 Velikovsky insisted that the sun's electromagnetic force affected not only on the way the ions in the comet tail move when close to the sun but also insisted that it greatly affected the orbit of comets, (he had these theories before the age of space exploration and the accompanying increase in understanding of the minute details of orbital mechanics.  i.e. concrete proof of the accuracy of Newton's equations.) He was wrong about comets at a distance but partially correct in his prediction of tails close to the sun. It was a common view that no other forces besides gravity and inertia act on orbital bodies.

#3 He was right Venus rotates backwards.

#4 It was found out that the temperature of Venus is higher then what it should be in relation to it's proximity but it is believed to be from the green house effect.

Velikovsky also made a prediction that Venus would be rich in hydrogen and be full of hydrogen clouds.  In 1963 NASA reported that Mariner 2 found hydrogen clouds on Venus however in 1973 the clouds were determined to be made of sulfuric acid.

#5 He made these predictions before the first lunar landings, everyone else didn't even consider these ideas. These factors could be expected attributes for many bodies.