diff --git a/Changelog.md b/Changelog.md
index 86b9e0f5..91ce25ec 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -87,7 +87,7 @@
 - docs: add `deserialize_with` example in readme
 - fix: Skip phonetic run
 - fix: Fix XLS float parsing error
-- docs: Correct MBSC to MBCS in vba.rs (mispelled before)
+- docs: Correct MBSC to MBCS in vba.rs (misspelled before)
 - style: use 2018 edition paths
 - fix: Add the ability to read formula values from XLSB
 - fix: support integral date types
diff --git a/src/de.rs b/src/de.rs
index b6a3d281..16a414fa 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -392,10 +392,10 @@ where
     }
 
     fn deserialize_map<V: Visitor<'de>>(self, visitor: V) -> Result<V::Value, Self::Error> {
-        if !self.has_headers() {
-            visitor.visit_seq(self)
-        } else {
+        if self.has_headers() {
             visitor.visit_map(self)
+        } else {
+            visitor.visit_seq(self)
         }
     }
 
@@ -405,10 +405,10 @@ where
         _cells: &'static [&'static str],
         visitor: V,
     ) -> Result<V::Value, Self::Error> {
-        if !self.has_headers() {
-            visitor.visit_seq(self)
-        } else {
+        if self.has_headers() {
             visitor.visit_map(self)
+        } else {
+            visitor.visit_seq(self)
         }
     }
 
diff --git a/src/xls.rs b/src/xls.rs
index 7df58862..80ed0dab 100644
--- a/src/xls.rs
+++ b/src/xls.rs
@@ -1320,12 +1320,12 @@ fn parse_formula(
             }
         }
     }
-    if stack.len() != 1 {
+    if stack.len() == 1 {
+        Ok(formula)
+    } else {
         Err(XlsError::InvalidFormula {
             stack_size: stack.len(),
         })
-    } else {
-        Ok(formula)
     }
 }
 
diff --git a/src/xlsb.rs b/src/xlsb.rs
index c6abd2c1..c4351211 100644
--- a/src/xlsb.rs
+++ b/src/xlsb.rs
@@ -377,7 +377,7 @@ impl<RS: Read + Seek> Xlsb<RS> {
         }
     }
 
-    fn worksheet_range_from_path(&mut self, path: String) -> Result<Range<DataType>, XlsbError> {
+    fn worksheet_range_from_path(&mut self, path: &str) -> Result<Range<DataType>, XlsbError> {
         let mut iter = RecordIter::from_zip(&mut self.zip, &path)?;
         let mut buf = vec![0; 1024];
         let formats = &self.formats;
@@ -651,7 +651,7 @@ impl<RS: Read + Seek> Reader<RS> for Xlsb<RS> {
             Some((_, path)) => path.clone(),
             None => return None,
         };
-        Some(self.worksheet_range_from_path(path))
+        Some(self.worksheet_range_from_path(&path))
     }
 
     /// MS-XLSB 2.1.7.62
@@ -669,7 +669,7 @@ impl<RS: Read + Seek> Reader<RS> for Xlsb<RS> {
         sheets
             .into_iter()
             .filter_map(|(name, path)| {
-                let ws = self.worksheet_range_from_path(path).ok()?;
+                let ws = self.worksheet_range_from_path(&path).ok()?;
                 Some((name, ws))
             })
             .collect()
@@ -1079,10 +1079,10 @@ fn parse_formula(
         }
     }
 
-    if stack.len() != 1 {
-        Err(XlsbError::StackLen)
-    } else {
+    if stack.len() == 1 {
         Ok(formula)
+    } else {
+        Err(XlsbError::StackLen)
     }
 }
 
diff --git a/src/xlsx.rs b/src/xlsx.rs
index 8dc48906..ff425bf7 100644
--- a/src/xlsx.rs
+++ b/src/xlsx.rs
@@ -68,7 +68,7 @@ pub enum XlsxError {
     /// There is no column component in the range string
     RangeWithoutColumnComponent,
     /// There is no row component in the range string
-    RangeWithoutRowCompontent,
+    RangeWithoutRowComponent,
     /// Unexpected error
     Unexpected(&'static str),
     /// Unrecognized data
@@ -121,7 +121,7 @@ impl std::fmt::Display for XlsxError {
             XlsxError::RangeWithoutColumnComponent => {
                 write!(f, "Range is missing the expected column component.")
             }
-            XlsxError::RangeWithoutRowCompontent => {
+            XlsxError::RangeWithoutRowComponent => {
                 write!(f, "Range is missing the expected row component.")
             }
             XlsxError::Unexpected(e) => write!(f, "{}", e),
@@ -380,7 +380,7 @@ impl<RS: Read + Seek> Xlsx<RS> {
                 Ok(Event::Start(ref e)) if e.local_name().as_ref() == b"definedName" => {
                     if let Some(a) = e
                         .attributes()
-                        .filter_map(|a| a.ok())
+                        .filter_map(std::result::Result::ok)
                         .find(|a| a.key == QName(b"name"))
                     {
                         let name = a.decode_and_unescape_value(&xml)?.to_string();
@@ -1213,7 +1213,7 @@ fn get_row_and_optional_column(range: &[u8]) -> Result<(u32, Option<u32>), XlsxE
     }
     let row = row
         .checked_sub(1)
-        .ok_or(XlsxError::RangeWithoutRowCompontent)?;
+        .ok_or(XlsxError::RangeWithoutRowComponent)?;
     Ok((row, col.checked_sub(1)))
 }