diff --git a/jwql/database/database_interface.py b/jwql/database/database_interface.py
index d94532ef4..8ae993633 100644
--- a/jwql/database/database_interface.py
+++ b/jwql/database/database_interface.py
@@ -144,7 +144,7 @@ def load_connection(connection_string):
 
 # Import a global session.  If running from readthedocs or GitHub Actions,
 # pass a dummy connection string
-if 'build' and 'project' in socket.gethostname() or ON_GITHUB_ACTIONS:
+if all(word in socket.gethostname() for word in ('build', 'project')) or ON_GITHUB_ACTIONS:
     dummy_connection_string = 'postgresql+psycopg2://account:password@hostname:0000/db_name'
     session, base, engine, meta = load_connection(dummy_connection_string)
 else:
diff --git a/jwql/tests/test_calculations.py b/jwql/tests/test_calculations.py
index 1c3fef2e5..dba2f8b9a 100644
--- a/jwql/tests/test_calculations.py
+++ b/jwql/tests/test_calculations.py
@@ -77,7 +77,7 @@ def test_mean_image():
             cube[i, :, :] = 5.
 
     # Insert a few signal values that will be removed by sigma clipping.
-    # Make sure you "remove" and equal number of 4's and 5's from each
+    # Make sure you "remove" an equal number of 4's and 5's from each
     # pixel in order to keep the mean at 4.5 and dev at 0.5
     cube[0, 0, 0] = 55.
     cube[1, 0, 0] = -78.
diff --git a/jwql/utils/interactive_preview_image.py b/jwql/utils/interactive_preview_image.py
index 1845e0d91..905f7a9bb 100644
--- a/jwql/utils/interactive_preview_image.py
+++ b/jwql/utils/interactive_preview_image.py
@@ -97,12 +97,12 @@ def __init__(self, filename, low_lim=None, high_lim=None, scaling='lin', contras
         if self.contrast is None:
             self.contrast = 0.25
         if isinstance(group, list):
-            if len(group) > 2:
+            if len(group) != 2:
                 raise ValueError(
                     'group must be an integer or 2-element list')
         self.group = group
         if isinstance(integ, list):
-            if len(integ) > 2:
+            if len(integ) != 2:
                 raise ValueError(
                     'integ must be an integer or 2-element list')
         self.integ = integ