This is permissible

The Imam in our Local Masjid has a Strange practice: in the friday khutbah he Talks about a specific Subject. Then in the friday prayer he reads specific verses who are about the Same Subject as the khutbah. Could You please clarrify if this is an Innovation in the Religion ?

Prayer | June 22, 2016 3:32 am
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Outside the masjid,since the long prayer mats are not equal size ,there are empty space in front of row and no one wants to pray on the bare ground. So is such a prayer valid as the long prayer mats are not equal in size and sometimes the presence of parked cars also cause disruption to the rows
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.If we pray behind imam should we recite surah fatiha bcoz it is da pillar of salah; one of my friends said if we don’t recite our prayers will not be valid.