Q: It appears as if the Penitential Act is omitted on Palm Sunday, if the Mass begins with either the Procession or the Solemn Entrance (But with the Simple Entrance, the Penitential Act is done). Is that correct? What throws me off is that, at some Palm Sunday Masses that I have previously attended, in some cases, once the priest gets to his chair at the end of the Procession or the Solemn Entrance, the Kyrie/Lord, have mercy (without the invocations) would be done, before continuing with the Collect, and in other cases, there would be no Kyrie/Lord, have mercy, and then the priest just continues with the Collect.
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A: Yes, you are correct.