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Not exactly. The cellophane "S" logo and the multiple holographic projections were traps Superman had prepared for the villains. This is confirmed by a line from the shooting script: "Zod begins to realize that Superman, on his home turf, has powers and devices at his command beyond their comprehension."As for the villains, the lasers they shoot were intended as heat vision, while their "disappearing" power was not teleportation but super-speed. Although it was written as such in the script, these powers were not accurately depicted on screen.
Briefly, but it was rarely used and later dropped.
For years, Donner has said that he was fired before he could finish "Superman II" over "creative differences" with the prodcuers, Alexander & Ilya Salkind, claiming that they wanted a "campier" film than what he had in mind, as the primary reason he was sacked. Ilya Salkind denied those claims, stating that the real reason Donner was replaced was because Donner wanted more creative control than they were willing to give him, and that Donner didn't get work well with Pierre Spengler, a long time collaborator of the Salkinds. However, Salkind has never disclosed exactly what the problem was between Donner and Spengler.
While not specifically stated, it is implied that he drained the power of the green crystal to restore his powers. In the screenplay, and as originally filmed, Jor-El used the remainder of his life force (from that crystal) to give his abilities once again. This was finally shown in the 2006 "Donner Cut".
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